Payment didn't go through

Morning!I went to the fix menlyn Park onthe second of June to pay my account using my id and the following day I was told that I didn't pay my account.i called their customer service and they advised me to go back to the store which I did.today as I'm typing this the matter is not being resolved and I'm still getting those messages and when I try to send email I keep same replying that they're still fixing the matter.im concern because this reflect bad in my credit score and everyday I'm told that they logged the complain on the date I'm making follow up.the consultant that I spoke to over the phone also said that the extra charges will be made if this matter is not resolved before the 12th.i really fail to understand that because they should look at proof of payment that I made a payment before that.please assist .On their system they say I have 2 accounts in 1 store and that is also wrong.