Vodacom - Poor reception

My company has an account with Vodacom with 4 phones and between these phones we spend thousands of Rand with Vodacom each month. Since November 2014. I am conducting most of my business from home. Since November 2014 I am complaining with Vodacom that the reception is so bad at that I have to stand outside my house to make calls. I received all sorts of promises but no reaction. Now after 6 months I am told that a new tower is required, but they can not say when it will be erected. In the meantime, I have to pay a third party to provide me with a booster if I so wish. Worst of all: I am not living in the sticks. My house is in Midstream just south of Centurion.