I've been getting calls every day from another Verizon number that has one digit lower than mine. ex. 678-555-2222 could be my number and I've been getting a call from 678-555-1222. 

Also, another Verizon customer claims they are getting a call from MY verizon number.  There number is one digit above mine. 678-555-3222.

They called me and told me about the issue.

I called the number calling me and they also claimed that they are receiving a call from one digit below them.

None of us are actually calling each other and therefore our numbers are all being spoofed.

Verizon, what are you doing about this?