Sani Rentals Holding My Deposit For No Reason

I rented a car with Sani Rental. I returned the car and whatever charges inowed, paid them. Till to date the company is still holding my deposit. I have made numerous attempts to find out about my deposit, till to date the company has not paid my deposit. Thus is not the the first time I am raising thus matter . The company holds the deposit for no apparent reason. Even if there are no damages and All charges have been paid, they still hold the deposit for no reason.