Game has logged me out and won't let me back in.

A few things you can try:

Make sure you’re signed into the same Apple ID/Game Center account you used before (sometimes iOS silently switches accounts). 

Open Game Center settings and check that you’re still connected, then restart your phone and launch the game again.

Try tapping the other login options in the cloud menu (especially EA account) even if you don’t remember using them.

Avoid starting a new game for now because it can sometimes overwrite the cloud prompt.

If nothing appears after refreshing, it might be a cloud sync issue on EA’s side. May be game needs update.

Hopefully your save is still there since your achievements are showing, that’s usually a good sign.

It's the same one, I've only had one game centre account. Unfortunately, after contacting EA advisors, they did tell me to 'start new game' to contact in-game support, so I did start a new game and am currently waiting for judgement. I sent them my purchase receipts so it's a pretty solid proof, I think? 
Game did not need updates (plus I only played yesterday) I took AI's help and tried most tricks in the book (Airplane mode on shut-down then getting back to wifi).
Right now Im not sure if my link has been re-written after using a new game, ai says it probably has been for now (since game centre is showing green for the new game while the other three show blue like the background) but also.. Im counting on monetary receipts to somehow lead me back...
Well, is there any advice from here? Thank you so much for your advice prior too!

Me too

This just happened to me today. Keep us updated on the judgement. I’d hate to override and lose all of my progress… sounds like an issue on their end for sure