sitestar CPU.net Sitestar , CPU.net have been pestering me to pay for servise I could not discontinue do to their negligence. Internet

Over a year ago  I found the CPU website and email server, and technical support and billing phones inoperative.  I was unable to order the discontinuation of the service.  I even did web searches and sent an email to the Chief Operating Officer I found in a search.  Then I get a bill from Sitestar for a year's service, stating my credit card rejected, which is correct because our card company changed our card numbers because of fraud.  In the  past, when my card expired they cut my service, and I had to call to get it restored.   So my wife called and they said I needed to send an email to cancel service, which I did.   Then I get a bill for two months service, plus extra charges.  My wife calls and they threaten collection.  I checked one time to see if it had been cut of yet and it had not, so they claim I used the service.   I have had another internet service for over a year!  I had to get another service because Sitestar/CPU  email servers stopped responding and I could not reach tech service.  I never received any notification whatever about CPU being taken over by Sitestar.  BEWARE!!!