OUTSTANDING PREMIUMS??

I went into the Cresta store on 28th Nov. at 11:47:16, settled my account, spoke to the Customer Service and closed my account. Apparently they had system failure but they closed the account and updated the system accordingly as advised telephonically at the branch. Months later and I still get phone calls for outstanding premium of +-R200??? Spoken to numerous Collection Consultants, they updated the system, send 2 e'mails to the CEO and customer service, NO JOY. Still being harassed by those phone calls. SYSTEM ISSUES, not my fault. Please trace the payment made at Cresta Branch as well as the phone call made at this Branch on 28 November at 11:47