device IP in settings is Invalid and received message that my phone is corrupted

[Elspeth11]

I have received 3 letters this month thanking me for purchasing and registering my new device, the names of the devices ( 3 right now)signed into my account are not the names of my only 2 devices, my passwords are changed everyday, I get texts and emails daily regarding access codes and security events, which I usually unable to access, 95% of my usage on one device, acc. to Verizon, is social apps yet I do not have one social account and never access those that don't require an account so WHAT can I do as this has all but destroyed me in 3 months

[vzw_customer_support]

Oh no, Elspeth11! We are concerned to hear you are having these issues, and we would be more than happy to help you today. Can you tell us a little more? Which passwords are changed on a daily basis? When did this issue start? 

RachelM_VZW

[jav6]

What 'letters' have you received?  Who are they from and how did they arrive (email or postal service mail)?