I would start by explaining to the beneficiary that at some point you are going to have to mail in a return with a separate document explaining everything you went through to get their social and their refusal. It will include their name and address and as much information as you have. Not giving you the information just makes them look bad and they get to pay extra. As the person in charge, gather all the information you can to turn them in when you do have to mail the return. You are responsible for trying and must show effort. Log your efforts.
If they still refuse and you can file an estate return without issuing a k-1 this year, that is fine. If you need to file k-1, a final return definitely, then you will have to mail the return and go through the extra trouble.
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