Taking money off my bank account *******ly!

I'm on yearly payment for the cheapest packet at MC. Suddenly last month an amount was taken off my bank account. I reversed it. Suddenly my service were switched off. After several visits to their office and the most unbelievable bad service and information given, we paid the yearly fee again, and the service was switched on after more phone calls and complaints. Yesterday, the payment went off my bank account AGAIN! I am hoping my bank can supply me with info to report them for taking money off my bank account *******ly! I have had no response to my request for an invoice of the last 4 years. Which is how long I have been on the yearly premium. I am so sick of this *********** company and will for sure cancel my service when this year is over. Actually I want to cancel it right away, but I'm afraid they will never refund me!