Telkom LTE 2 Year NIGHTMARE

When Telkom Mobile offered LTE to my area and their coverage map as well as their call centre agent confirmed I was eligible, I signed a contract for their unlimited offer. After waiting 3 months for the account to be activated I was finally able to connect but from the first day my connection speed fluctuated between around 2Mbps upload and 29Mbps. I would have been happy with a stable 15Mbps (They advertised up to 90Mbps) but the service just wasn't usable. I must have raised about 6 tickets before I actually had an engineer contact me. I was told that someone needed to come to my address to test my setup (I already had the external aerial installed)... It took the engineer 9 months to get to my address, this after almost daily, definitely weekly chase calls, texts, emails etc... I need to add that I was paying for the service all this time... Eventually on the 7th Aug 2017 (16 months after I signed the contract) an engineer attended my address, ran a load of tests and confirmed that I would never be able to receive Telkom LTE due to my geographical position. Telkom agreed to cancel my contract and I was told I would be refunded all the time I was paying but unable to use the service. I have since found out that in spite of me paying for a service I never received for 16 months, I have a judgement against my name and they claim I still owe them money. I have never in my life dealt with incompetence like this, every phone call and online chat was a non stop run around with not one person willing or able to take ownership of the issue. Now that I am trying to chase down this judgement, it is impossible to speak to anyone who can actually do anything about it. All they tell me is that they will escalate, well it is over 2 years now since I signed the contract and I am still waiting for just one vaguely responsible person to contact me... Is there anyone who can tell me what my legal rights are and how I start to deal with this gigantic mess that Telkom has so kindly made me pay for... Thank You