Bad network for long period

I have a 5GB data contract with Vodacom. At Kungwini Estates in Bronkhorstspruit my signal is usually 3/5 and shows 3G/4G. One day I will have download speeds of 8mb/s and the next 0,2mb/s. Many a days like yesterday I have no internet at all even though it shows 3/5 signal. I have reported this several times to Vodacom. The last time it was on 11 March with reference a2-1llk-k8O1ac. They said they will call me in 2 days but have not done so thus far. This problem has been going on for more than a year. Fix your problem Vodacom or release me from my contract!