Poor service to assist re Network Coverage

Our whole household have contracts with Vodacom cellphones, also WI-FI and a Tablet. The problem is that we cannot effectively use our cellphones as the Network Coverage is very poor, but the worst is that we cannot use the Wi-Fi as the Network Coverage is EDGE, so to use Internet is an almost impossible task. I went to the 3G shop, first they suggested I move from 3G ****le to Wi-Fi.. I took out a new contract but are still not able to use Wi-Fi although they are billing me every month. I have also logged a few calls, and sent emails. I asked them to install Temporary Booster Antenna to support us while they are looking for a more permanent solution. They called back and made promises to come back to me, but no one bothered to give me fixed answer. It is now over a year and still no progress made. only empty promises of a new tower but it is almost end of the year? REQUEST: all I am asking is that they install Temporary Booster Antenna, they can take it back when they have sorted out a permanent solution. They have installed this for a friend of mine, so why cant they do this for us? We are loyal Vodacom supporters for many years. I just need honest answers to where I stand.