Shocking! Super Bad Service!!!

All I ever wanted from May 2016 was a settlement amount from MTN. I went to the Cresta store and was told I needed to pay R1834.00 as per their system, and I paid that amount end of May. Early June I paid R1000, and late June R700. I paid R400 paid on the 13/07/2016 at MTN Lakeside Mall @ Benoni which they say does not reflect on their system, but i have sent them proof. I just keep paying but my lines have been re-allocated to other people. How much do i still owe MTN after i paid almost R4000? This is affecting my credit status but i am trying my utmost best to clear my name, do I have to take this matter to Clientele to get your attention?