Telkom poor network coverage

I have been a loyal telkom customer for many years now and I currently have 5 mobile contracts with them but I am very disappointed in the network coverage I receive with data and calls. My biggest problem that I have is a wireless internet package which I'm spending 499 on but I don't get any 4 g signal at all only 3g the whole day long, when I app**** for the contract they checked on their systems and told me I have 4g signal but now it's a year into my contract and I feel like I have been paying them for no service at all, I can't even surf the internet without hanging so I have not been using it ever since.