CANCEL MY CONTRACT!!!!!

I really do not know what to do anymore! The Vodacom booster in our house broke in January, me and my husband have phoned multiple times to get them to fix it, but now, 11 months later, Vodacom still has done nothing. We are sick of phoning and asking, so we have decided to cancel our contracts, since Vodacom doesn’t care!!! Now we cant get the contracts cancelled, I keep getting put through to someone else, who knows just as little as the previous one. For *** Sake, just cancel our contracts!!!