Florciax Having the pre-order bonus shouldn't affect your ability to play. What happens when you try? If you get an error message, please post a screenshot, and either way, describe what you see.
This site isn't EA customer support, and most of us posting here are volunteers. Even the EA community managers don't have the kind of access to players' accounts that would allow them to remove this content from your game library. That would require going through the EA Help portal:
https://help.ea.com/en/customer-care/