Did you joined a social media campaign? and the registration form is the spreadsheet for those bounty?
In this case, you might send a message to the bounty and tell him your concern and what are the details that needs to be fixed so he can modify it.
Definitely he do mention about social media campaign because he said about facebook.This is indeed the best solution just message the bounty manager who do have access on the spreadsheet since he's the only can able to make changes.
And he didn't replied to any of us who suggested what to do. I see some rules of very strict managers so I assume that there are strict managers that once you have input a wrong or duplicate info, they will reject you definitely.
But if they don't have that type of rule you can ask the manager politely to do that favor for you.
Most of the bounties will reject if they registered in the signup forms multiple times so better contact the bounty manager or find the better bounty.And also now a days most of the bounties have telegram chat for their bounty participants so they can get quick response there if he made a query.
It is what I've suggested that he/she just needs to contact the bounty manager to make these things properly. In everything that's related to the bounty that they've joined, contacting the manager is the best thing to do.
Yes, those channels of telegram made by that bounty made it easier to contact any of that bounty participant.
I'm still waiting for the reply of the OP if he did all the things that we have told him.