I used to work for a company that Epic Games outsourced their support to. We were based in Athens, Greece. There were other companies receiving the same email pool on Helpdesk Bulgaria or Romania, as well as an Indian office, all supporting US customers via email.
We were paid 3.5eu / hour and our performance was micromanaged by counting how many replies we did per hour.
Hence, we had canned responses that we'd copy/paste to save time and maybe achieve a bonus for that month.
Unfortunately we ended up being shit on on reddit on multiple occasions because some poor guy misunderstood the request and a legitimate request would be promptly denied, even though it shouldn't be. The level of English comprehension varied wildly among us.
All I'm saying is maybe Rockstar actually has a way to ID your account based on IP addresses, credit card used, date purchased if you have the receipt email, driver's license etc and you're just dealing with an underpaid dude in Eastern Europe not quite understanding you.
Usually if you threaten to sue they escalate to tier 2, so you may have more luck that way and tbh I don't know about Rockstar, that's how Epic did it back in 2018.
Maybe try explaining it a different way? I dunno but good luck.
Edit: I just saw the rest of the messages in your comment.
I wouldn't have given you back the account either in their shoes. You just claim things that anyone could claim from their point of view, they have procedures they need to follow.
They can't try your password, or see it anywhere and would never ask you for it either.
They're asking simple things that you should have been able to verify. After that they'd likely ask for IP addresses and last 4 digits of card used etc.
They have to do this, or anyone's account could be hacked by social engineering all too easy.