Pathetic service

I`m an unhappy client, i had a Game RCS account which was handed over to VVM attorneys. They gave me a balance and was also given a discount which i arranged a debit order for 3 months. I paid the account in full for that period and received a SMS from VVM confirming the account is fully paid and a paid-up letter will be sent. To my surprise last month i received a SMS from a company named Daly RCS and I'm told i have an outstanding Game balance of R165.71. I advised the person that i have paid this account in full and i don't know what they are talking about. I advised them that i paid via VVM and received a confirmation back in February already. At this time i was furious and this lady told me to get a confirmation letter from VVM which i requested. VVM advised me a letter was sent to my email in March which i did not receive that and they will not be sending any letter because the system shows a paid-up letter was sent. I checked my email dating back to February, no letter found. This Daly company kept on sending me these annoying sms`s about this balance. So on the 25th of May i decided to pay an amount of R165.71 which was quoted. Now i`m getting these sms`s again saying i owe and the amount is accumulating interest. I sent a bank transaction screen shot of the amount i paid on the 25th. Still no confirmation received. What kind of business are you running, this negatively impacts my credit score and according to your consultants there`s nothing that can be done.