Vodacoms terrible coverage

I used to get good cellular reception at my property but over the past year the vodacom network has degraded so badly I need to stand in the corner of my property to get coverage. After complaining, Vodacom has sent out their guys to investigate and it is taking well over a month and half with zero resolution in sight. They suggested a solution where they can guarantee that only one room in my house will get coverage via extra antenna's etc but thats simply not good enough for a cellular service. This is a built up residential area with many towers around us so I am interested in the reasoning. I am have been handed over to vodacom contractors and yet to speak to someone senior at Vodacom who can get this fixed. What erks me is that this was working for 2 years prior and now it isnt and there is no end in sight.