Vodacom Signal from bad to worse...!

I have tried numerous times to report our terrible diminishing Vodacom reception... With my last conversation with the call centre they assured me that they will send someone out to come and test the signal within 10 working days. This was more than 3 months ago and I haven't heard from anyone since. We have 11 Vodacom contracts between the 3 permanent houses here on the farm, and more than 20 employees with Prepaid Vodacom. All these Vodacom phones are no longer useable due to no signal anymore. 2 Of our contracts already expired and I am in the process of switching it over to MTN (MTN recently installed a signal booster/ enhancer for the MTN users here). The people at our Vodacom branch insisted that I first report our poor signal before switching over to MTN. (Due to the Signal Booster from MTN we have FULL MTN signal). So I hereby request one last time that Vodacom do something about our diminishing signal within 30 days, or all 11 contracts will be transferred to MTN.