Telkom network is not as good as I thought

I'm very disappointed with the Telkom Mobile network. I left my previous mobile network because of network issues and ported to Telkom, now I'm not sure if it's where I want to be. The network can be extremely bad while my data expires unused; I loose a lot of data just like that. Always better data deals but what's the need if you cannot use them. Worse part is that whenever I'm in *white* based areas I have full network coverage all the time, this tells me that Telkom values their white customers much more than us black customers.