You are in need of speaking to the carrier who is branded on the phone only they can legally unlock it correctly. If you can not do that you have to send the phone to someone who has the ability to "flash" (alter the programming of the device). We do not offer hack or work around services unfortunately.
They are not always the answers you want to hear but my job is to give the right answers. I feel like a mechanic at times because people do not love the answer to their issue unfortunately.
Thanks for reaching out to us!