Mimosa Mining Company (Private) Limited v Elton Nyoka

Mimosa Mining Company embarked on a retrenchment exercise for cost reduction. Elton Nyoka, an employee, applied for voluntary retrenchment on 25 June 2014 and requested to purchase his allocated company vehicle (Toyota Hilux) for US$16,087.00. Mimosa agreed to dispose of the vehicle at book value. After three valuations were obtained, the book value was determined to be US$27,206.98. An agreement of sale was entered into on 19 August 2014 and the vehicle was transferred into Nyoka's name. Nyoka's retrenchment package was computed at US$111,317.16 (less tax) and he was paid US$70,116.59 on 5 September 2014. The accounts department inadvertently failed to deduct the vehicle purchase price from this payment. In December 2014, Mimosa's lawyers wrote to Nyoka advising of the oversight and requesting payment. When Nyoka failed to pay, Mimosa cancelled the sale agreement and demanded return of the vehicle. Nyoka refused to return the vehicle or make payment, claiming the vehicle price had already been deducted from his package.

• Whether there was a valid contract of sale for the vehicle between the parties
• Whether the purchase price of the vehicle had been deducted from the defendant's retrenchment package
• Whether the plaintiff was entitled to specific performance or payment for the vehicle
• Whether the defendant was unjustly enriched by retaining the vehicle without payment
• Whether the cancellation of the agreement was valid
• Whether the plaintiff's failure to deduct the purchase price absolved the defendant from payment

1. The defendant was ordered to pay the plaintiff US$27,206.98 being the agreed price for the motor vehicle (Toyota Hilux D/C, registration number ACI 7353, engine no. 2KD-5554140). 2. Each party to pay its own costs.

Where parties enter into a valid contract of sale with agreed merx and pretium, an administrative failure by the seller to deduct the purchase price from amounts owing to the purchaser does not extinguish the purchaser's obligation to pay. The purchaser cannot retain the benefit of the asset without payment simply because of the seller's oversight. The doctrine of unjust enrichment applies where: (a) the defendant is enriched; (b) the enrichment is at the expense of another; (c) the enrichment is unjustified; (d) the case does not fall under classical enrichment actions; and (e) there is no positive rule of law refusing an action to the impoverished person. When an error in failing to collect payment is brought to the attention of the party who received the benefit within a reasonable time, that party is obligated to either return the benefit or make payment. The party alleging that payment has already been made bears the burden of proving that assertion with evidence.

The court observed that while an honest mistake may excuse substantive liability, it does not necessarily entitle a party to costs if the mistake was not compatible with due diligence and reasonable prudence. The court described the plaintiff's failure to deduct $27,206.98 for a vehicle while remembering to deduct $10.00 for staff expenses as being "penny wise and pound foolish" and negligent. This negligence justified departing from the normal rule that costs follow the event. The court also commented that by the time of judgment, over two years had passed since the agreement of sale, making return of the vehicle (as opposed to payment of its value) no longer appropriate. The court noted that there was no requirement for parties to enter into both an agreement of sale and a separate acknowledgement of debt, and that a party cannot rely on internal company policies and procedures that were not produced in evidence to create additional contractual requirements.

This case is significant in Zimbabwean contract and employment law as it clarifies the principles of unjust enrichment in the context of employment separation agreements. It demonstrates that administrative errors by an employer in failing to make agreed deductions do not absolve an employee from contractual obligations to pay for assets acquired. The case reinforces that unjust enrichment arises when one party receives a benefit at another's expense without just compensation, regardless of the financial status of the parties. The judgment also provides guidance on the standard of proof required when a party alleges that payment has been made - mere assertion without supporting evidence is insufficient. Additionally, it illustrates that while a party may succeed on the merits, costs may be denied or varied where the successful party's own negligence contributed to the litigation becoming necessary.