A call, received from 720-233-6565, left this number as a callback number.

They claim that the recipient needs to call back to reactivate a "vacation package" that "expired before 2014" before it is "deleted from our records".

Numerous "Red Flags" that this is a scam:
Very vague on details; no company name given, no mention of where the vacation is supposed to be taken, it is an "urgent message" that needs "immediate attention", and further, the claim that it expired sometime over three years ago; so the receiver will consider that they may have simply forgotten about being offered a "vacation package".