Vodacom sales- terrible after sales service

I was sold a WiFi contract and told that if for any reason I was not satisfied I could cancel within 7x days. I am now in my second nonth- after cancelli g within 7x day period- but because it is almost ipossible to cancel with the call centre, I am still paying for equipment that I have not used for a month because Vodacom have still not been able to collect, and none of the branches want to assist because tgwy are total separate entitues??!!???