I will never use europcar!! Not helpful at all

I was double debited for a hire car. I was debited the deposit amount. The next day I got a call saying they need to re-debit me again but the first deposit will be refunded. It is over 3weeks and I still have not gotten my deposit. I have spoke to Nomsa and she has not been helpful at all , not one at EUROPCAR wants to sort this out. I don't know what more I can do to get my deposit back.I WILL NEVER USE EUROPCAR!! Due to this I have had debit orders bounce.