Wow, I'm glad I didn't buy ACII Complete a couple of months ago when it was on sale, after reading all of the problems people are having with it. I came very, very close to buying it.
[quote name='todrigo']I went through this with the exact same game a couple of months ago. Bought the full bundle for $14.99 but never tried to play it until much later. When I finally did try it was "expired". Transaction showed full game purchase but DL history showed only the add-ons. Was able to get only the $14.99 refunded, no credit to rebuy the full package again at current price. I bought a used copy of the base game thinking that it should work with the add-ons but I haven't tried yet with that (my backlog is monstrous) now I'm worried since you said yours dissapeared afte the refund.[/QUOTE]
Did you check and see if the base game is further down on the list of your downloads? If you downloaded a 60-minute PS+ demo of it a long time ago, for example, then it might show up on the download list at the time that you downloaded that demo, since the demo file is the same as the full game file in that case. I've noticed some cases, where I've downloaded a demo a year or two before buying the full game, where the Full Game Unlock shows up near the top of the list, and the demo download shows up near the bottom of the list, so I'm thinking maybe a variation of this happened to you.