This means your phone is active on BOTH PagePlus and Verizon - and whenever this occurs, when you do OTA, the Verizon number overrides the PagePlus Number.
1. Contact Verizon, give them your ESN, ask them to DISCONNECT the Verizon number from it. YMMV with this option (Your mileage may vary) because the account is probably not in your name, you may need your seller to assist.
2. You can manually program the device with your PagePlus settings, and it will manually override the Verizon settings.
If an ESN is clear on PagePlus, it is normally clear on Verizon - as in this case.
Hope this helps.