comet car rental

I have rented a car from them. This is not the first time. Was always happy with their services, but this last rental went wrong. I brought the car back on Monday normally the deposit paid is back in my account in 3 days. Today it is 5 days and I decided to give them a call. Jossline the accounts lady admitted that she forgot about the deposit. I ask that the money must be in my account before 4 pm today. She said it was possible if I pay the cost on the immediate transfer. Why must I pay for it, it is the fault of Comet Car Hire. After our telephone conversation 20min later she send a POP. This means I will only see the money in my account on Tuesday. I send an email to the branch manager (Cathy) and phoned a couple of times but she also don't want to come on the phone. Really I will not rent a car with them again.