TFG account not updating their records

TFG group gives an option to pay the account in different ways, one of them is to pay online via the TFG online account. I paid my account using the method on the 23rd of May 2018. When Receiving the next statement I noticed that the payment was not updated then I went to Markhams store and ask them to check for me. They requested that I provide a bank statement, IF and store card which they emailed to the TFG head office. When I make a follow up with the call center I was told that the bank statement is not sufficient as they won’t be able to pick up the payment, I should submit my bank card used to make a payment together with ID and bank card of which one of the debt controller acknowledged my email and said she will contact their contact at the bank to trace the payment and allocate correctly as they have lots of transactions that are not allocated as they system is not effective. Since from May to date this issue is not resolved instead I receive calls and sms that my account is not arrears and they charge R20 for each call and sms and Email tjey send. And almost every day the debt collectors are calling that this is affecting me with the credit bureaus. Im told that I should ignore the message and calls but meantime there is a charging on my account.