lost account

I have a FC Mobile account that is only linked to an EA account. When I try to log in using my EA account, for some reason it seems like the progress has been reset/lost. What shocked me was that the account was stolen by someone else. I mean, how could he unlink the EA account so easily that I didn't even realize it. Please provide a solution. I have tried help from EA and from within the game but got bad results (they can't help or something) maybe I entered the wrong option so I also need a solution for this. 

UID first: 977211638754390016

UID now (Using the same ea account): 1094243241327525888

I have proof that it is mine, namely a top up transaction at an official store.