[2023] Ac Valhalla data corrupt after game removal from Ps+ extra

Good afternoon. I downloaded Ac valhalla from Ps+ bought the dlcs and played for nearly 170 hours . All of a sudden game no longer was accessible due to ubisoft removed it from ps servers on DEC 20 . I went out and bought the physical copy of the game however once downloaded it states all saved data are now corrupt and will need to start a new game. i have logged on to ubisoft and my data record of the game is their so my question to ubisoft how can i retrieve my data so i may continue to play or have i wasted my money. The game is also up to date and i have downloaded the data from online storage to system I look forward to your response.