Totaled over rear suspension?

I'm changing my rear suspension on my 2010 Ford Escape. I got the old shock off but the inside metal bushing of the shock is stuck on there. I decided to give up and have a shop finish the job and they said if they can't get it off my car is totaled. Any advice on how to get it off myself? Tried de-ruster, heat, and a lot of elbow grease. Pictures are of the new shock and the piece that's stuck on. Thank you!!!