Mtn *****s money and still bills me

I paid an early cancellation fee for 1904.50 on 28 March 2015 for my number ***. The amount of R1904.50 was taken by mtn and never allocated. Since March I have been querying this endlessly. With this number I had another top up data line that I paid 109 rand a month. In July, MTN finally decided to cancel my 060 number and hit me with a bill of R1557. Despite several attempts of emailing their retentions department and speaking to several agents who apparently raised requests to their accounts department for the resolution this was never resolved and I have been billed in July, August and now September. Now I can't call the call centre as both my numbers have been terminated. Please can MTN fix this and take out any outstanding money from the R1904.50 that I paid which seems to have been more like a donation as I have still been billed every single month regardless of my numerous pleas. Mtn, leave me alone and stop trying to ***** money R1569.31 from me every month!! How can I even owe you that when I had a top up line of R109 that you still debited every month? Please someone help!!!!