Bad service

My husband took out a new sim contract after canceling a few years back. The contract is 99. Every month the installment is more than R100, 5he debit order is on 25th, every month money is in the account for deduction but I don't know what they do because every month the installment reverse and he needs to pay R300. This month again this **** happened. When we call the callcentre the *********** consultants talks about the Bank canceling the debit order which I have never heard this before as I'm working for a Bank. Their service is pathetic. How do you do this to your customers every month. Is this how you make money? Or do you have you run your business? I have 2 contracts but my debit orders amounts changes monthly but didn't have any issues with them. My husband is the fool here. They should call him.back on *** and fix this mess. His account is not suspended due to arrears yet the installment went off ...wow