Thought of moving over but not sure now

I have been a MTN customer from when cellphones came to South Africa and have decided to move my personal number to Vodacom where I have a few other cellphones for my mom and others. I was shocked to find out that my reference with Vodacom said 'Bad payment record' yet I have a credit with Vodacom and before the credit a debit order which has never bounced. So I have told the consultant helping me that maybe this is a sign I should not move to Vodacom. Not a good way to do business. Please explain why my reference says that when I have never had a debit order bounce and I have a credit with yourselves at the moment. Maybe I should rather stay with MTN!!!