Unjust damage claim

Was charged for a scratch to the rim of the car I rented after handing the car back & having done a full hand back inspection with the Sani representative. This very minor scratch was not picked up at all when we did the hand back & am 99% sure was not caused by me. The vehicle was a replacement vehicle due to the first vehicle breaking down & the handover of the replacement vehicle was done very scantily on the side of the road. I’ve objected to this claim of theirs & am now unable to contact anyone to take up my objection. They have all gone to ground & haven’t reversed this damage claim . I really suspect that this is part of their business model. Claiming from customers for damages not incurred, or claiming multiple times for the same damage.