when you made this post, given this is your first season, i figured 99% chance it was user error. but given the recruiting history, that doesnt make sense. the game DOES have special logic in place for ghost shipped teams, and it deals with first season teams, in particular. i dont believe its a coincidence that you have 2 walkons left now, and the game will sign players up to 2 walkons if you don't do anything.
i would make sure to include in the ticket that there are 2 walkons left and that seems suspicious. my experience is if you can point CS in the right direction, they usually are pretty good, but not really playing the game and having all the details at their fingertips, they sometimes struggle if you offer no insight.
bottom line, the correct response here is for CS to remove the player from your team. so i'd mention the 2 walkon thing and just ask they remove the player. that gives them an easy out - its WAY easier for them to remove the guy, than to figure out the root cause. (assuming, of course, you dont want that guy)