Not returning your deposit

I am extremely angry and disappointed with Tempest Care Hire, I have rented cars a lot in the past, my first time with Tempest and what a terrible experience.

I rented a car, they charged the deposit on my card. I asked them how long before they return the deposit back to me, they said 72 hours. I have phoned numerous times and its now 8 days later already. They say its an IT glitch on their side, they have no reference number to supply you so you can keep track, every time you need to speak to someone new and explain the whole scenario over. They say they will phone you back, they don't. Asked to speak to the manager, the 1 is apparently on training and the other one on maternity leave. Really, when you deliver a service to clients, you can't use excuses like that, not the client's fault they are away. I have never received such poor service from a company!