Most of us who've been on the planet a while know that the 555 exchange is reserved for inbound to the TELCO or used in entertainment (TV, movies, etc.) for fictitious phone numbers. That right away should be a giveaway that the call is bogus.
Called landline twice today. Will not answer as they are a telemarketer, spam merely, or scammer all the same thing in my book. Please stop these bozos from trying to tricks us, scam us or whatever.