MR Price worst customer service

So each month I pay my account in time and I pay way more than I should. Never missed a payment or short paid. This month Mr Price is sending me messages and giving me rude phone calls telling me that I should pay my account in full before month end and that my account is in arrears, How can my account be in arrears if I made a double payment the month before. So I phoned customer care, who then transferred me between 4 different people to tell me whole story to, and in the end they came back and told the me, that the store where I made my payment, made a mistake, I should go back to that store, and get them to phone head office to rectify the problem. How does this became my problem if my payments is made? Now your waisting my time and money for traveling to a store to sort out problems you as company made, and if that is not bad enough customer services as is, Mr Price is giving me a bad name for putting my account in arrears even when it is NOT.. This will make me never shop with you again and rather close my account.