Cancel DebiCheck

I have sent emails to this company to request for my DebiCheck to be cancelled, after I paid my account in full beginning of this month. There had been no response. The lack of communication is pedantic. I will not be overpaying an account I am not planning on using in the next few months. My debt has been paid. If more money is taken I will take further steps with this company, that will be considered as theft. I want a paid up letter as well. I am appalled by the lack of customer service or communication from outside Collector, Easton-Berry. They are quick to set up the debit orders and take your money, yet can't respond when you want your things cancelled.