MTN can't even do basic business transactions

MTN seemingly can't even get a monthly debit order right. They fail to implement a contract upgrade debit order correctly on the first month, retry deducting the full amount in a second debit order transaction and fail, then let you know you have to pay the balance because the bank doesn't allow them to deduct twice (for obvious reasons). You go to a branch pay the balance, then the following month they fail altogether to deduct the monthly premium. So what now? You've got a debit in place in their favour, and still need to beg them to take your money?