STOP HARRASSING ME!

I notified Tech5 I was relocating and disconnecting my service via ***, they checked my new city for coverage and they didn't offer it. Then a few months later they debt my account for a service I cancelled. I reversed the debit and emailed them proof of my cancellation. They then put me into collections and I have these debt collectors who have been calling me going on a year now. I share proof of cancellation but they just keep harassing me for payment. I won't pay for a service I cancelled. STOP HARRASSING ME!