Minimum to no signal at all

We have been having problems with terrible to no signal for years, the first time we complained they checked the towers in the area and the signal improved. However the last year or so we have had minimal to no signal and this is effecting our business. We are on a small holding and all our neighbors complain that there is no signal. We don't have Telkom lines as they constantly steel the cables and therefor rely on our cellphone network. Vodacom requested a list of telephone numbers that are experiencing problems and I gave them approx 10. I can actually give you my entire client base as they all battle when on our premises. This is ridiculous!