Who called from 3059084315

This was the reported Caller-ID number from a missed call (to my cell phone).

5 missed calls no voice messages in 2 hours on my cell phone.

This is Cigna Health

Wanted personal info.

This is a good Cigna Medicare Health Spring number.  We use this service provider.  But when I returned their call, they had no record of trying to call me.  The phone only rang twice.  Possible mistake?  Possible robo-call?  Possible scammer cloning this number?  Who knows?