I cannot ask for a refund because, like I said, I was sent the code for the game as a gift (if you have to know, it was for my upcoming birthday). I cannot stand to play the game in Russian, it just doesn't feel the same to me, even though the voice-overs aren't all that bad, but that is completely irrelevant. I have played COD since 2008 (on PS3 though) and always in English.
It is region locked to RU/CIS, but my country, Armenia, is in the CIS region. This issue has been a pain in my ass since I was gifted the code for BO3. The Language tab is missing when I go to the game's Properties.