MTN debit orders

I have just phoned MTN to query why there is such a large debit order that has gone off my credit card to be told: 1. It is a payment for the last 3 months because MTN didn't take the money off. 2. MTN don't do credit card debit orders anymore, I need to get a debit card ???? 3. I need to go to a branch to pay my account. While every other company is going forward with technology, MTN looks like it is heading back to the dark ages