Frustration!!!!!!!!!

A subscription was made once I tried to cancel it , I still get billed every month. Tried to stop payment at my bank, yet again they deduct the subscription. If no funds available they continue to deduct the money from my account letting me have bank charges. They deduct every 3 days so an accumulation of 8ayments not made. How difficult is it to understand I don't want your service any more. So frustrated. If this does not stop..........