Poor service

I am not happy with the service I'm receiving from them, I have chances jobs so I changed banking details, they were informed ahead of time and emailed me to say I cannot do that, they debited over 10 times for the same month, and I have to pay that fees, up till today 2 months later I have been doing efts, as the debit order still not sorted, I'm also looking at refinancing and get another vechile but it's been over 2 months and still no response after paperwork have been sent in.