No customer service,only finance department

I was informed that my payments did not go through. I found out from my bank that a debit order was never created on my account by Altech. Just like my car reg no that was faulty in your system I believe your accounting department made a mistake with my debit order. I phoned and talked to a lot of people but all I heard was I must pay the arrears. They did not hear when I told them its not my fault,neither did they listen when I told them that I had a faulty unit from the start. On the day unit was tested I was told the unit must be replaced. Just like the day the unit was installed they could not again install a spare remote. I then realised the unit was faulty from the beginning. I do not want something for free but I believe to pay for something that works. Now you give my name to layers to force me for paying for something that does not work, but if Altech Accounting department did there work my only problem would have been faulty unit. Your debit orders would still have gone through every month. UNBELIEVABLE