Cartrack is feeding on cancelation fees

I recently had a second tracking device installed & since the installation I have been receiving calls from car track saying that they haven't received the prorata. I have confirmed my bank account details over and over again, & even sent a confirmation of Bank account confirmation, they still don't take the money. Now at this month end, both tracking devices were not payed for again. I really don't know what they want me to do & honestly I have had enough with the everyday phone calls. I asked them to cancel both contracts and they telling me of cancelation fee. They did the same thing to my husband last year. I don't know why I thought it would be different with me