Contact #’s Changed By??

I already knew my cell # was on the dark web (for years), but within the last 4 to 6 weeks I started to realize my contacts’ phone #’s that have been stored in my phone for 15+ years were somehow different #’s now.  Even my husband’s # was changed.  Some of my texts to people were getting rejected….When I call a contact that the # has been changed it always goes to a generic voicemail.

One week ago, I was texting with a friend who said, let me give you a call real quick.  I waited for about 10 minutes wondering if she forgot but the phone ended up ringing.  She said she had called me twice and it went to a Verizon voicemail?  What in the world could be doing this?

Thanks guys and gals!