Poor service

I visited vodacom at Midwater in Middleburg to apply for my router, uncapped data. Was helped and got my router, took it home. Router worked for couple of days, and boom, stopped working, I took it back to the shop for assailance, they called me to come fetch it because it was working according them. Got home, plugged it, router not working. Took back to the shop, till today, it has been a month without the new router, and was billed for it. I logged 2 cases with their help desk without assistance. Called the cancelation department to camcel, I was told to go to the branch, at the branch they told me they escalated matter. They said they don't know what to do. I logged a complaint with complaints@vodacom,and didn't receive any feedback. I really don't know who can help me now.