Still deducting more

Last month we had a deduction that was more than suppose to. This month we received our account with a certain amount and they deducted another amount that doesn't make sense. Is the amount on the account not the one they are suppose to deduct. When my husband phoned them this morning everyone's excuse was that the system is offline. They were very short tempered and didn't take customer focus into consideration. If this is how they want to treat their customer they better start looking for customers elsewhere. Because the are slowly but surely going to loose all their clients. Please fix this and pay the money back in the account as required.