Bell PTA (Private) Limited supplied technical services for machinery at Macatoo Mining's premises in Hwange since 2011 on an ad hoc basis. In September 2012, Macatoo complained about poor service quality, stating Bell's technicians were overstretched and prioritizing larger clients. Following discussions, parties agreed to have a full-time technician stationed at Macatoo. On 7 January 2013, Macatoo issued a purchase order requesting supply of a full-time technician for 200 hours/month, asking Bell to confirm price and start date. Bell sent a draft memorandum of agreement proposing a one-year contract at $10,300 per month, but this was never signed by either party. A technician was provided on a full-time basis (evidence disputed whether this started in January or February 2013). Macatoo paid for February 2013 services and on 17 May 2013 paid $27,396.39 for what it believed covered all outstanding amounts based on invoices received for actual hours worked. Bell then issued invoices claiming $41,400 for March, April and May 2013 based on 200 hours per month at $60/hour, stating previous invoices contained errors. Macatoo disputed this, arguing it had settled all amounts owed based on actual hours worked on a job-by-job basis.