I’m getting phone calls from my health insurance company, first from a “registered nurse” with no information in the voicemail other than a call-back number (seems like it could be a scam, but I need to verify the number, so far people are saying the number is legit), and now I have a second phone call where the voicemail mentions they are calling from the insurance company’s “concierge program”.

Mostly I want to know if I can ignore these calls without consequence, or if I have to return them, and if so what should I expect?