How to get details of an IEMI lock

I recently bought a second-hand phone that is unexpectedly locked to Verizon. Is there any way I can speak to a human to find the status of the IEMI lock (days remaining etc)?

So far the tech support phone numbers I have called have automatically hung up with a message that they only accept calls from Verizon phone numbers. But I am not (currently) a Verizon customer.