I AM NOT YOUR CUSTOMER! STOP BILLING ME

I am so horrified at this company and their level of service. Last year November we needed Fibre urgently and so we signed up with Metro Fibre. Their staff member dropped off their router and told us it will be activated by later that day. 3 whole weeks later and 101 phone calls and emails later and we still didn't have service. Mind you, there was other people on the same property that signed up the same day as we did and they up and running while we was kept being pushed around. After 3 weeks of purchasing data to run our business we canceled the services and requested that they collect their router back. A few weeks later and they send me an invoice for payment for services I HAVE NEVER EVER RECEIVED! I called them and the lady who took my call hung up the phone after I told her i want my cancelation done today. Every month since, I receive an email with an invoice and every month since I proceed to email back and forth and explain the issue again and I keep getting every month that my cancelation will be processed and that the matter has been escalated. Nothing gets resolved! Hours on the phone and so much money spent on phone calls just to get cut off or hung up on or push off the call...