High bill for services not rendered

I am furious with supersonic experience. They keep charging me for their services even after they failed to re-active their router. What am I paying for since the router is not working. Been calling them none stop requesting re-activation of router but was never assisted, now they sending me an invoice with September billing. Supersonic has the most horrible customer service I've ever seen. The consultants are so ***********. Instead of helping you on the line they promise to call you back and they never do. I am stuck with a high bill from supersonic. It's not the first time they charge me for service that was not rendered.