If something like that happened to me and it was clear that Ebay was making it a hassle to undo that so they could steal money I no longer want them to have, I'd go straight to the BBB with it. Doesn't matter how small the problem, if Ebay wants to do that to you, don't put up with or waste your time with their games and put offs, get it fixed with a very minimal effort.
If Ebay doesn't like it, they can stop causing the problem.