Tempest car hire and deposit refund *******

I'm writing to express my deep disappointment and disgust, with the after service I have received from Tempest. I rented a vehicle from them in early January and paid a deposit of R7158. I was very careful not to damage the vehicle and returned it in perfect working order, as it had been taken. The lady receiving the vehicle, signed it off as perfect with NO defects or charges, and confirmed on the day that I would be receiving a full refund with in 5 working days. A few days after returning home I received a partial refund of R2754. I was not notified of any deductions, or given any explanation as to why? The amount deducted is R4404. (£184) I have tried making contact with the company via email and phone and I am yet to get a response. Do Not trust that you will get your deposit refund back from them!