Non existing contract

Good day<br> Mixtelematics is claiming to have fitted my car with a tracking device without my consent and according to them I have signed contract with them which I have never seen in my life. They have been secretly debiting R99 from my account since March 2014 and I couldn't see it because my bank does not notify any transaction less than R100. In March 2015 their premiums went up to R245 and that's when I got to see and went to the bank to reverse my money and block their debits. I sent them a cancellation email that they demanded after I had contacted them, even though I was never their client. Ever since then their lawyers have been calling me with awkward numbers at awkward times threatening to send my \falsified account\" to arrears and blacklisting me. I have no business with this company whatsoever, I wish they can just get rid of my name in their systems and leave me alone!!!! "