Old Mutual let business premises to Ocean Echo Properties 327 CC under a written lease concluded in November 2008. Angelo Giannaros bound himself as surety and co-principal debtor for Ocean Echo’s obligations. Old Mutual later sued for arrear rental and charges, alleging Ocean Echo was in breach. The defendants pleaded that the lease had been tacitly terminated in December 2011 when they vacated the premises, Old Mutual accepted a new tenant (Solomon), and began receiving rental from that tenant. They contended that any arrears were due by the new tenant and that the suretyship terminated with the lease. Old Mutual excepted to the plea, arguing that the alleged tacit termination was contrary to the non-variation and other clauses of the written lease.