Booking.com Won’t Let Me Cancel My Avis Car Rental Despite Free Cancellation

I made a car rental reservation through Booking.com with Avis for a compact class vehicle to be picked up in Mytilene on 02/06/2026, under reservation number 738123871. According to the contract conditions shown during the booking, I have the right to cancel this reservation free of charge until 30 June. Since 1 June 2026, I have tried numerous times to cancel my reservation both via the Booking.com mobile application and the website. However, each attempt ends with a technical error in the system and the process does not proceed to completion, so I am unable to finalize the cancellation myself. Because of this problem, I am at risk of being charged the full reservation fee of 4,546.17 TL, even though I am trying to exercise my right to free cancellation within the specified period. I also tried to reach customer service, but I could not get through and therefore could not resolve the problem via support channels. As I am unable to complete the cancellation due to this ongoing technical issue, I request that my reservation be cancelled free of charge, that no fee be charged to me, and that written confirmation of the cancellation be provided.