Harassment & Faulty account system

I was notified of my account being in arrears by VVM Debt Collections on the 11/05/2015.I called them immediately to arrange payment, I received a sms stating that I will get a 25% discount on payment (R1473.24 to R1104.94).I made requested payment at Cape Gate branch and I was informed I was up to date on account but the discount did not apply.I left the store - my slips showing that I was not in arrears and my account was up to date (the R 368.30 being the 25% discount promised to me).On Tuesday,13/05/2015 I received another sms from VVM stating that I was in arrears and needed to make payment, I called again and spoke to consultant Lauren, she confirmed I was not in arrears and could not understand why this amount was there.She then called her supervisor (Mike) who said he will sort it out and call me back.On Friday, after receiving no feedback, I called back but he was not available.I called Edgars on Friday to confirm that I was not in arrears and the balance left on was to be paid with installments. The consultant then left a note stating the account was not in arrears, yet I received ANOTHER email from VVM. This is totally UNACCEPTABLE. SORT THIS OUT EDGARS!!!!