Hey all, I've been at this for a couple months now. Same problem as most of you: Apparently my gamer tag got connected to a random Origin account and I can't get it connected to the right account. Fortunately, I seem to have made SOME headway in the time that I've spent trying to fix this for myself. I contacted multiple EA Game Advisors through the chat service on the EA help website. Finally, I got someone to tell me that what you're trying to accomplish is called a persona transfer case and that it is possible. BUT, you HAVE to call EA's customer service line because only they have the tools to do it apparently? So, after six hours spanned across two days of trying to reach a human on their customer service line, I put in a request on their website for them to call me. FINALLY, I got a hold of someone there. He had me verify a ton of things to make sure that my Origin account was actually my account. After some confusion, he seemed to understand what I was trying to accomplish. He then had me verify that my gamer tag was actually mine. UNFORTUNATELY, I apparently put in a date of birth that isn't my actually date of birth when I made my gamer tag. The ONLY way they can verify your gamer tag is through your DOB apparently, so if you don't know it, you're basically screwed.
SO! My suggestion to those that still have this problem: Try calling the customer service line and explaining the situation to them (I'll post the number at the end of this message). Make sure you tell them you're trying to do a "persona transfer case." It might be easier to put in a request for them to call you on the EA website (Again, I'll post the link to connect to a game advisor at the end of this). That's the only way I got connected with a person.
[Admin. Edit] Please contact support via this link: https://help.ea.com/en/contact-us/
EA Game Advisor Link: https://help.ea.com/contact-us (Just click the big blue button, follow the steps, and when it finally lets you connect to an advisor, choose the option to have them call you.)
Hope this helps, guys. This issue is serious bull **bleep**. But, that's what you get for dealing with EA.
