Unauthorised funds deducted from my card.

I received a final demand from sani fleets lawyers for an amount of R4841.00 three weeks after the vehicle was returned and signed off as received in good order. This was supposedly for a service that was missed. I rep**** offering to take the vehicle for a service as an oil change service on a steed bakkie does not cost more than 1500. No response and my card was debited with the amount this week. This is *****!!! And I still have. It received my deposit back as yet. Reading the latest reviews it seems sani fleet has cash flow issues and not able to return deposits to people.