Re: I want to play Sims 3 pets that I bought from Steam in Origin.

@hcaxjxy  I take it you're not interested in installing the game through Steam, which limits your options.  You can contact Steam support and request the key, which may or may not work.  Or you can contact EA support (again) with proof of purchase from Steam and ask for Pets to be added to your Origin account.  (You may need to wait a few hours for support to be available again, or else change the location in your browser window.)  I understand that this didn't work the first time, but perhaps you just found someone who didn't know what to do here.

This site can't really help with Steam issues.  But if you have another bad experience with EA support, please let me know, and I'll ask if there's something else you need to do here.  This problem can be solved, or at least it has been for other people in the same situation.  To my knowledge, those players didn't do anything special, they just explained the situation and provided proof of purchase.