I am so sorry to hear that! I was just reading on another thread that some have been able to do it and some have not. I will say, I don't think the regular reservations CMs can do it. It has to be escalated to Guest Services. But, if you have called 4 times, wow, you have tried as hard as you can to get someone to help you.
Tickets do not lose their value and I'm sure next year things will be better - more restaurants will have opened, more experiences will likely be taking place and there will be more hotel choices - so if you think you will go in the future, saving the tickets is not a bad option in exchange for getting 35% off the room. I do think it is frustrating that it comes down to how great the CM that randomly picks up your call is, and not a standard, consistent response across. When do you arrive again?
For reference, this is the other thread:
https://www.disboards.com/threads/can-i-drop-tix-w-recovery-35-off-rate-was-fd-bb.3806132/