MTN debiting Incorrect amount

After being hounded to migrate to MTN business to gain more "value" I caved and clicked ok... My contract was migrated to Business this month. My old contract price is R939. My business contract price is R939. My debit order date has remained the 26th. BUT this month I was debited R1575. Thats over R600 more than what was supposed to be debited. I want this amount reversed, you are *****ing money. I will be stopping this debit order MTN cant resolve it this week. Your call centre numbers are impossible to reach through the labyrinth of press this number holes that lead nowhere.