Cheating clients

I rented a car with Avis Car Rentals (East London Airport) for 1 day on the 30th of November 2017 at around 08:30 am, a lump sum deposit was deducted from my credit card. I then returned the car on the same day at around 16:30 pm.

My Rental Agreement Number is ********** 55.

A few days later I realized that I was billed for 2 days with car, I tried to call customer services a couple of times but to no avail. I hope they don't intentionally ***** from people because car rental transactions don't give sms or email notifications from your bank.

I wan't my refund and I will not rest until they give it back to me.