All three accounts paid in full but still paying

Good day. Cellc has been a nightmare! Inccedent ***.In 2015, ( yes last year!), I had paid cellc in full for all three of my contracts I had with them. I was at the absa bank in Pretoria waverley side of which I had recieved and forwarded the proof of payments to cellc. I had no response in two weeks first of all and took me to phone them (which is on huge mess, there call centers don't know which \departments\" to forward me to!), a cellc representative phoned me back the next day and asked i send the proof of payments to [Email Removed] of which I did. Ref no ***. This was the 5/11/2015. I waited another 4 weeks and still the one debit order for cell number *** went off? I then contacted cell c again to find out what is going on and was promised buy cellc they would allocate the money paid by me and forward my proof of payment to the relevant department. Another 2 weeks went bye and still no call or form of response from cellc? I still to this day the 25/3/2016 am paying for the one account and cellc still have not solved the account? Cellc has lost my respect as a customer and frankly cellc is just letting this happen so I still pay!disgusting!"