Untrue charge of damages

Sometimes in September 2023 , I rented a Suzuki swift from EUROP CAR as courtesy vehicle when my car was involved in an accident.

When I return the car they told all is in order , meaning no damage was found on the car.2 days later they called me and say there’s a dent on my car and I must pay them +-R2700.

Definitely this damaged they claim wasn’t done by me , now their lawyers are busy harassing me.