I suspect this will be a very expensive example of the dangers of booking a car using a CDP discount code without having entitlement to use it.

I would expect Hertz to assess the following charges:

• Cost to repair/replace the vehicle
• Cost of loss revenue to Hertz while their car was unrentable due to the accident
• Cost of towing to/from the lot where it was towed to
• Cost of car storage while car is at the lot it was towed to

I hope the person(s) in the car that the OP hit weren't injured (or claim injury) or this will become even more costly.

It sounds like that the OP isn't a US citizen, based on the language in their post. If this is the case, it adds complexity as to if there's any credit card or personal insurance available to help cover the costs above.

Finally, I think there's a good chance that Hertz could put the OP on their "do not rent" list.

Best of luck to the OP.