No signal for 4 months. Bad customer service

Very disappointed with Telkom's service. I got a portable wifi router last year June with "on the go" data, which I only later found out that it is telkom only data. I got average signal in Roodepoort up until around October/November where it just said no service at all. I called Telkom to find out whats going on, was on the phone for 40 mins where they gave me instructions on how to fix it which didnt work. They then told me to turn roaming on and allow it to roam on the vodacom network. Which also doesnt work because on the go data is telkom only?! They couldn't offer me any solutions and just said their towers are down and they are not working on it to fix it, its been 4 months where I have to pay for nothing. If I want to cancel the contract I have to pay a ridiculous penalty fee and pay for the router which is not possible for me as I'm still a student. But now I'm stuck paying a monthly fee for 20 gb data which I cannot use because there is still no signal available. Why sell telkom only data if you can't deliver proper signal? Even when travelling the mifi router barely picks up signal.