Worst Service Received from Debt Collectors VVM

Telkom Mobile only cares about numbers (money). I went to Telkom store still was 8ta then to update my banking details. The lady assisted me didn't submit my details. Only after few months VVM contact me stating the amount i owe R4000. I immediately paid R1500 of the total amount, following month i paid R1000 but forgot to put in the reference number. 3rd month agent calls me stating that they didn't receive 2nd month payment as agreed. I was shocked but told them to give me email address to where i can send the proof of payment. The department that in charge of that took a 2 month and half to update it their side. I kept being called by the agent and fighting with them as they lack support from their end, when i looked the original amount i owed them, comparing with the amounts kept paying. I over paid them, even though they were lacking to reply to my proof of payment yet i kept being penalized. I still have all copies of payments and emails sending them to give update on my account, guess what? NO ONE BOTHERED TO REPLY TO MY EMAILS, only time they call me was month end. I even sent email copied one the team leaders whom i also sent proof of payments MMutshunyalo!!! Useless