POOR SERVICE CAR TRACK

I did a change of ownership, new client contacted car track with the new details, I keep on getting demand letters that there is money outstanding, had on numerous times spoke to client services regarding this, THEY WILL SORT IT OUT, nothing is happening and then this morning the money that was owned was deducted from my bank account, without any permission - I think this is very poor service, quick to get sales but after sale service is POOR!!!