Why do i have to pay for their systems problems!!!

After signing up with Nashua Mobile for a R541.00 contract monthly, i picked up after 3 months of changing my contract that i was being billed for huge amounts i never agreed to. i addressed this with MTN who confirmed to me that my contract was loaded incorrectly when it was moved from Nashua and that they will correct everything. <br> it was a hustle to get that right, i then got a bill for R3452.00 that i now needed to pay them after not getting all the added value specs that came with the contract for almost 3 months (data/airtime). this is after they suspended my phone while i was busy preparing for my uncle's funeral. i went into one on the branches and was advised to reverse the debit order and changed me to a cash customer until they correct my correct because they owed me and not the other way round. now again this morning my phone gets suspended for what?? i queried the R1187.26 that's still showing and was told to ignore it they must correct it. <br> <br> now while waiting for this to be corrected, i must put my daily routine on hold and try and solve this yet again!!!! whose fooling who here and what is the process i need to follow to cancel my contract and do away with MTN