:lookaroun As far as I know you can always change your tickets until they are activated? and always upgrade at any time. I know you have tried everything but had you thought of the annual pass' and then the annual waterpark pass' We bought those for my daughter and granson last year. Do not remember if they had an option for Pleasure Island with it or not?? Just a thought! ( Then you will have the whole year to use them again, & again--- good excuse to come more? Hummmmm )
I understand what you are going through-- we had a problem with tickets last year tooo very upsetting. However, like you said it is Disney and if you want to go, and we here all do, you finally end up giving in--
We had ( florida resident ) seasonal pass' and wanted to upgrade to the annual for the summer ( we are blocked out then ) and were told we could not as they had expired to long ago--

Mine was OK, but not my daughter or grandsons--
Well, I finally spoke to someone who said they would do it--- ( at City Hall MK ) as a one time thing, and when we got there, she was not working and they would not do it! Even though she had made a note on the computer in my name!! However, we did check another place and the CM there, after hearing all the problems, gave us a comp. pass' for the day with a free fastpass' for test track sooooo there is still hope!!
Good Luck! Hope you have a wonderful time-- Owwwwww I want to go!!! :lol: