Frustrated at the incompetency of Vodacom

Its now month 3 that I dont have working internet because of an *********** sales guy that just wanted to reach a target. He "upgraded" me to a so called "bigger and better" wifi package with higher speed, this all without doing his homework in checking that it will not work in my area. I had PERFECT working wifi previously and since this "upgrade" my internet has been non existent. The amount of hours I have spent on the phone with Vodacom is insane. I was told to return the unit and they will revert me back to my original plan its been over a month that the unit was received by Vodacom and it still has not been done, yet they keep charging me monthly for internet that CANNOT be used. I have been a customer of Vodacom for over a 20 years, I am at a point where I want to cancel all my contracts and just go somewhere else! I cannot go on like this anymore, all I asked was to be put back to the wifi contract I had in August so I can continue to work as usual but it seems that all the people I speak to are *********** and cannot complete simple task. Everyone I speak to keeps referring me to different departments, telling me "my system does not allow me to see this or allow me to do that" resulting in immense frustration. I have spoken to so many people, repeated the whole story numerous time, spoken to managers, my query has been escalated and still NOTHING!!!! What do I need to do in order to get working internet again!!!!!!!!