Sudden Bill on ended contract

I have just received a sudden Bill of R1002 from Mtn for a contract that ended on the 14th of April 2015, of which I had appeared to be handed over to the legal department twice in the past 3 months, when I've never missed a payment. To top it up I got ****** 2 weeks after the last payment which I made at the Mugrave branch, when I called to block the line and phone I was told I couldn't block it through the prepaid line which is 173 I had to do it through 808. The same 808 that was unreachable for the past 3 months even when you called in form an man store. So I took iylt upon myself to visit their store in the Bluff only to find that it was closed cause of a strike... then now I've got an outstanding amount of R1002 from where cause the contract was long over before I even got ******? I don't need any clarification or nothing I just want that balance revoked and my name and account out of your data base cause I've had nothing but problems from Mtn since I took the contact