Limited/No network connectivity

For a while now I have been experiencing connectivity issues with Vodacom. It's not only myself but a number of people. I stay in Randfontein, work in Krugersdorp and travel much for business related issues. No connectivity. The week before last I was at my house in Pietermartizburg. If you're lucky you'll get data and voice connectivity. Sunday I was in Brits the same thing again. I'm standing with my standing with my 8Ha phone on the exact spot and have no problem. The error we're all getting is \Not connected to network"and a few more. If this issue is not going to be resolved I'm going to cancel my contract with Vodacom and they will financially responsible for the remainder as there is no service delivery. I'm sure you don't want to lose so many customers"