WiFi issue and a serious lack of service/assistance

Since the new year my wifi ****le has been giving me continuous problems. it keeps showing an error stating " Rejected for Network" in one day i phoned in 4 times and the consultant assisted me to sort out what he thought was the problem which solved the issue for 7 mins exactly each time and then the problem persisted. i have reset the ****le removed it from my phones wifi search and re added it using the password, and nothing seems to work. i don't have time to phone all day, so vodacom suggested i take the sim and device to my "nearest Store". i have been there countless times since Feb 2 and each time the technician is either on holiday, off sick, or on lunch, not to mention i must pay this technician for a problem that isn't mine. so i must no inconvenience myself to drive out of my way to sort out vodacoms problem. this makes me a very unhappy customer especially paying for 2 gigs every month and not being able to use it, and I'm very much considering cancelling my contracts with Vodacom. i have been with Vodacom for years and praised them to all my friends i even pay more than required every month, but if Vodacom cant sort out a simple wifi issue then what will happen if the issue is bigger?