I'm sorry you've lost your husband. Dealing with Social Security is never easy, and when you're coping with a spouse's death, it's ever so much harder.
It's disgraceful but typical that you're having such problems getting through to Social Security.
It looks as if they're strongly urging everyone to use their Website before calling but supposedly if you keep trying, you should eventually get someone who can help. Dealing with Social Security takes a LOT of perseverance.
This link should take you to a section on the SSA Website (June 29, 2020) called "Can SSA help me by phone?"
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