Vodacom coverage disappoints still

I have been a loyal customer since '93, and have been staying in the same house in Easttown Jhb since 97. My reception has never been great and I have had regular calls drop etc, but I have been fairly able to get a conversation done, and even get calls. Have logged numerous calls through the years for this to improve. I and friends or clients, are now at the point where we can only get and make watsapp calls, or if I walk out and stand in the bottom of the garden, make calls. This is what I get for over a R1000 a month, time to shop around I guess!!