WiFi contract

I signed up with a contract for WiFi in February and ever since I got it I haven't been happy with the service. I called a few times with regards to changing the package and was always given an excuse yet other providers have better packages this morning an amount if almost double went of my account because my account wasn't capped and this is really frustrating as we all work on budgets, I call the call centre who's system was down and counted cap it to 0. I decide that I no longer want this as I am tired of having this constant issue and I'm not even happy with the service I'm receiving I am told that I need to pay a R2000 cancellation fee which is absolutely crazy and I refuse to pay that amount especially if I haven't been happy. I would appreciate it if this could be sorted out by some manager and my matter is resolved as I no longer want this contract.