Incorrect Billing and no support

I cancelled my account with them over 6 months back. They called me to let me know everything was correct and that there was nothing outstanding. Then this year they start billing me and tell me that I owe them for January and Feb. I called them and the bunch of idiots working there could not answer any questions I asked. To date no manger has called me back and they have not corrected the mistake on there side. Will never recommend them again thanks to the terrible service I have received.