Appalling service, no feedback, no accountability.

I had 3 contracts with MTN, Contract A&B both expired on the 15th July 2015, I sent numerous emails prior them ending, asking them to cancel & migrate my number to prepaid, & when the last install would be. Never received full feedback. In Aug they debited my acc for the 3 phones & I reversed it, I sent them an email informing them of their error, as only 1 remained. I also asked them to send me their acc into which I could pay for my remaining contract. Sent follow up emails -no response! They did the same thing again Sept, again I reversed it. I phoned them worried about the remaining contract going in arrears, the consultant explained that the final payment was in Aug hence they kept debiting all three. This angers me because I requested on many occasions when the final instalment would be & nobody could tell me. I then asked for the finance dept. where we came to a payment arrangement. I have been paying EVERY month since but they have blocked my number. I sent another email asking what the balance is on this contract & they told me that they could not tell me as it was with legal dept. I called their legal & gave my ID & was told they do not have my records, now what?