Mysterious cancelation by Tracker

Tracker canceled my contract and deactivated the tracking unit on my car, I only became aware of this when I called in to enquire when I realized their debit order didn't go through as usual, I was told I called in to cancel my contract which I certainly did not,how can I cancel my contract and request them to debit my account? Tracker is now requesting me to pay a service fee before they can repair/reconnect the unit,how fair is this?Car tracking is one of the critical services in SA and it's also a requirement for car insurance, I believe Tracker should reinstate my services while they are still searching for proof that I indeed requested them to cancel my contract, nobody at Tracker seems to understand this even after more than five long calls