unhappy client

hlo im randall van rooyen a lewis loyal customer..ive been harrast 2times in 1day over the phone they said im behind with my payments..and i know for a fact im 2800rand in advance on my acount i always pay..im very unhappy and they didnt even apologise to me for wrongfully acusing me of not paying my acount..im from somereset east..and i want my complaint to b heard..because alot of people heard the conversation over the phone now people are talking of me not paying my acount...the phone call was at work now even my manager asked me why dont i pay my acounts..im humilated by what lewis people did