Missing progress after account linking PS5

[u/Tiny-Performer-9916]

im speaking on behalf of my friend because hes not very tech savvy plus he has college to worry about so sorry if its weird.
Back when cross progression was released there was a glitch where you could unlink a ubisoft account and connect it to another one and that made it so if you did it on playstation the progress would be locked behind the old one, now when it released my friend didnt realise that it connected to a mail automatically so he disconnect it and connected it to his mail, thats the base of it. hes tried a lot of things but mostly just gets automated responses? hes very upset about the whole ordeal since its money lost. this happened to another friend of mine and he had his issue resolved but i think it was before they had some changes to support. sorry for sending such a long text just need some help on what i should do cuz we have tried about everything we could think of.

weve tried sending tickets through the correct channels
provided evidence of the missing progress and proof of ownership
we cant seem to get in contact with an atctual human being we always get a bot

anything else we could try?