I am sorry to disappoint you but I had the same problem a year ago when I bought BF3 Deluxe Digital and it was never solved with the "help" of Origin's tech support.
Despite the fact that it's clearly stated on the Origin site/store that the game is delivered in a bunch of European languages INCLUDING English, it has the only option in the end: Russian audio, Russian interface. MANDATORY, no options (nevermind the fact that you're forced to use the Russian version of the store, no matter how hard you try to refuse doing it).
Well, I was sure that it is a no-brainer for the tech support to give you the right link to the desired installation since a nice amount of money had been paid on the customer's side. Boy I was wrong!
It took ~2 months for them to address my issue (after I had quite a bunch of on-line chats with the tech support).
And all I got in the end was: "Sorry, can't help. The game is region-locked, enjoy whatever you downloaded. Bye."
So I wouldn't lay too much hope on this matter this time either.
The Russian "dooblyatori" are out and after us, ready to screw any good gaming experience.
Sadly, same goes about the whole movie watching experience in Russia.
I am 38 now, and I have no desire whatsoever to:
1. Be fooled again;
2. Be forced into buying the product with the translation which was totally uncalled for (and it's not like the purchase is 0,99 cents either);
3. Talk to useless tech support for ages.
So what I did this time with BF4 pre-order was -- I just contacted a friend of mine in the US, asked him to buy the bundle online from his IP. And then just transferred the amount of money via paypal to cover his expences : )
So, the proper, ENGLISH version of the game is already in my Origin client now, waiting for the beta/official release date to be downloaded.
And as for the BF3 issue (though it's almost too late already, since BF4 is at your doorway) -- contact me via private message mate, I'll give you the proper links to finally change the whole thing to English (both interfaceand audio). Legitimately, no hacking or whatever.