MTN

We had a contract with Nashua Mobile who has now turned our contract over to MTN as they closed their doors. MTN decided that they would deduct money from our bank account for Feb before the debit order date. My husband only gets paid on the 31st of the month even if it is a Saturday. They decided to deduct on the 30th and now the bank is charging us R138 unpaid debit order. NO one at MTN is prepared to help. I want to pay the instalment for this month but no one seems interested in helping me. I am sure they will cut the phones when they realise if is not paid this month but don't care to sort it out with us. We have sent emails and so many phones calls. They want to come tell me that they will not refund the debit order because the 31st was a Saturday. Nashua Mobile deducted on the next Monday if the 31st was a Saturday. How can MTN just change things to suit them. MTN just do not care about their customers and we have been with them for many years. This has never happened before.