Incorrect debit order

I have had Net star in my vehicle for about 4 months now. When I signed up with them I asked for my debit order to be on the 7th of every month. Up to now they have not got it right. Have not paid them due to them not doing the debit order when I get paid. My wife transferred money to my account last night as I needed petrol and to get a few things. As soon as the money was in my account Net star had taken the money I owe them after I have spoken to someone at the call centre asking to do the debit order on the 7th and not the 25th or 30th or anything like that. I was advised it would be changed. I had to reverse the debit order and I pay for that to happen. I would not recommend Net star to anyone due to the fact they don't care about the customer. I would never have gone with them in the 1st place as I have been told by a few people how bad the service is. It came as part of the car when I bought it.