Why won't HTC support my broken HTC HD2 Touch?

My htc 2 stop working in July 2011, I paid for poastage mailed my phone to HTC for repairs. HTC returned my phone latter August 2011 said it was repaired. I paid for the repairs. November 22, 2011 day before Thanksgiving. I immediately contacted my carrier, worked with repair technicians trouble shooting my phone. After working with over 15 employee,the conclusion was my phone is defected and cannot be repaired. I was very surprised my phone only lasted for two months after the repairs done in August 2011. My carrier asked me to contact HTC to replaced my phone with a brand new phone. HTC is refusing to give me a new phone. HTC asked me today to send the phone to them for repairs. I am refusing to return the phones for repairs, when I know for sure the phone is defected. As a consumer what should I do? I have been without a phone since November 22,2011. this is such an inconvenience. I have been using a $14.99 phone from walmart which is not very good. I missed out on taking pic during the Christmas Seasons due to no camera, no phone. Please advise. My phone was still under warranty when it stop working on November 22,2011.