Error in calculation while trying to shorten my staying in a hotel.

GetHuman2608997's booking change request issue with Hotels.com from March 2019

Help with my Hotels.com issue
The issue in GetHuman2608997's own words
Tried to reschedule check out date for a day earlier. ... Dear sir*madam* *I booked the Sphendon hotel in Istanbul using hotels.com site and paid in advance (confirmation number ************). Recently I was informed that Turkish airlines canceled all flights for the day of our return, and I was forced to reschedule out staying in Istanbul and return one day earlier. When I tried to reschedule the booking on hotels.com, I was unpleasantly surprised with the calculation asking me to pay extra *** euros instead of refunding the payment for one day. I also sent you a mail with more details, but no response from hotels.com. Please advise. Magdalena Terzi*
Not blaming a hotel for anything. Hotels.com didn't provide the correct service of changing the reservation as promised. That prevented me from rescheduling on time.
Booking.com should refund the hotel price for one day of staying.
I used all options available at the site including the customer support. All proofs that I was right were ignored (a forehand email where I presented my case, a screenshot of a false calculation).
Letters to hotels.com, live chat with customer service, phone call to hotels.com representative in Turkey while staying there.
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Hotels.com

Hotels.com booking
booking change request issue
Reported by GetHuman2608997
Mar 27th, 2019 - a mon ago
I have an issue with Hotels.com too
Fixed
Seen by 5 customers so far
Similar issue to 223 others
0 customers following this
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Timeline
GetHuman2608997 started working on this issue
Mar 27th 10:01pm
GetHuman2608997 indicated the issue is not fixed yet.
Apr 14th 6:12pm
GetHuman2608997 indicated the issue is not fixed yet.
Apr 14th 6:39pm
GetHuman2608997 indicated the issue is not fixed yet.
Apr 14th 6:40pm