Paying for service that is not provided

I live in Randburg. At my home I have a basically non-existing cell signal and bad data connection via Wifi modem. I am paying a cell and a data contract for nothing. The first time I called Vodacom about this I was told that the network is overloaded and that a new tower has been approved and needed to be installed at some point in the future, the second time I called they said that a new tower is in the approval PROCESS and they don't know how long it will take. None of this is my problem as I am paying for my contracts NOW and get no signal NOW. I want a solution to this instead of vague promises. I expect to be provided with a signal booster to see if that will help