OK, I don't know if this will work (mostly because I can't remember the criteria for the emblems you're asking about), but you could try contacting EA Help to report missing items. To do this you'll need to head to help.ea.com and search for Battlefield V, select "See more help topics" then choose "I'm looking for something I bought". That should let you open an email case so that EA Help can investigate and award the emblems if you are meant to have them.
If, however, the emblems came from pre-ordering BFV, from the Road to Battlefield V event, or from a promotion at the time, then EA Help won't be able to provide them.