MTN WORST SERVICE EVER!!!

I have been a loyal mtn customer for almost 4 years. In December 2014 I added another additional number cellphone on my account. I have always had a absa cheque account and they have always debited my account for the past few years. After the upgrade they suddenly did not apply the debit order, suspended my account so i went and paid cash. Phoned them to put the debit order back on gave them all my details again and once again no debit order, account suspended had to go in and pay cash. Phoned again to have the debit order put back on for the 25th of the month. And once again no debit order account suspended. Phoned MTN told me debit order was backfired and they will debit again on Monday. I asked her for my details and she tells me I have a savings account starting with the number 19.WHAT THE F? Where did they even get that details? Really pathetic...they even had the audacity to tell me I have to pay the penalty for the backfired debit order!!!WHAT???? AND EVEN MORE THE ACCOUNT IS IN ARREARS WITH DOUBLE MY CONTRACT AMOUNT? SO they will be debiting everything from my account all at once??? BIG Company with really stupid people.I must upgrade now,Don't think I will stay with MTN