Telkom provides terrible service.

Telkom must be the worst company in South Africa when it comes to service. My 200g LTE data package just stopped working on the 22 nd of February. My download speed went from a good 15-20 mbs to 0.5 mbs. Since then I have made 30 phone calls, visited their branch 3 times, spend hours upon hours on the phone with these suckers trying to get them to get someone to fix my problem. Today I inform them that with no internet for almost a month now, and nothing being done about it, I would rather cancel my contract to get a different deal from someone else. I was politely informed that it would cost me R 25 000 to cancel my contract, as this is only month 3 of 24.....and my 7 days to cancel had long since passed. The lady just could not understand/ accept the fact that I cannot pay if I get nothing. Yet they do not understand the concept. Telkom politely told me that I will pay for their non existing service for a full 2 years, weather they provide me that service or not. With every call I make, I get a promise from the person that they will look into it and call me back.........guess how many callbacks ive had? Just to clarify, the internet worked fine for 2 months, then almost completely stopped working, The router was tested and nothing is wrong with it, leading to the conclusion that the problem lies at the Telkom signal station in my area. Any suggestions on what I could do next?