3 weeks and counting

I hired a car from Tempest and returned it on the due date with minutes to spare before being charged for an extra day. 3 weeks later I still have not received my deposit refund. Countless emails back and forth and being told the deposit was paid to me when it wasn't. I am upset at the poor service and lack of proper communication. I want my deposit refunded as said by yourselves at Tempest and on your website. I have been told countless times 3 to 7 working days...It's been 3 weeks! I won't use this company again and I'm not going to give up until I get my deposit back.