Holding Deposit Refund

Getting back my holding deposit has been a nightmare for the past 3 times I used Woodford Car Rental. I have to call their branch every time for them to expedite. On a recent case: It is August 21 today, I returned the vehicle on the 11th August I however have'nt received my deposit back. The first and second time I let it slide thinking such mistakes happen, but I can't be experiencing the same thing over and over.