Returned shortfall deposit.

Hi, I hired a car at tempest from the 21 to 23 March 2019. I paid report of R1200. I returned the car on the 23rd and the lady who inspected the car said everything was fine. I was expecting to get my full deposit of R1200 only to find out they paid R1070. There was no phone call or email explaining the shortfall. Tempest I want my money back in full.