Exceptionally poor service

The network coverage in my area has never been up to standard. My first complaint was logged in March 2015 and then again in September 2015. I run my business from home so it is important to have network coverage and be contactable at all times. I was told that a new tower was being setup and the network signal would improve. We are still sitting on Edge. Over the last month we continuously have No Service. The final straw was on the 24th of March where I received calls. I was told they could hear me but I couldn't hear them. I logged a complaint. On the 29th the problem had been reversed where I could hear the caller but they couldn't hear me. The last communication I received from Vodacom was on the 31st telling me to check my SIM card and device. My response was that all had been checked but how could that be the problem with 5 phones and yet all works fine when leaving the area. It is now the 4th of May. I received a client call this morning and once again they could not hear me. Three weeks of this and still no resolution. Vodacom is clearly not my preferred network and will not renew in October. Frustrated and annoyed!