Poor service

I had a contract with Ctrack in 2013, I think. They were debiting in my Capitec account monthly, they stopped around 2015 for reasons not known to me. I did not get any communication from them, I though maybe they canceled these services. Fast forward October 2019, they sent me a message stating I owe them R4800, I was shocked, they also threatened to ruin my credit record if I don't pay immediately. I also received a call from their collection agent to make an arrangement, I then told them I need clarity on this. But I got busy and forgot to contact them as I needed an email address instead of a phone call. On 15 November 2019 I received an alert from Transunion and I then checked my credit record, I was shocked to learn that I owe Ctrack R66 000 with a monthly installment of around R21 000. I'm a very angry with these guys and their conduct. Kindly assist.

Name: Luthando Geza ID Number: *** Contact number: *** Cellphone: ***