Bad network, bad service

We're experiencing bad network connection since we moved to Waterval Boven 3 years ago, numerous service requests were logged during this period. Last year I was promised a network signal booster at no extra cost; I never received it. When I enquired about it, I was told to go to a vodashop. When I went to the one in Nelspruit, 100km away, I was told they have never sold it, they don't do it. When I phoned customer care again, they told me to go buy one at incredible connection or somewhere. Why can someone else in our town receive one (installed over this weekend) but I don't get mine as promised? Also the network connection stays the same without any improvement. Is this the way they treat customers of almost 30 years?