XT1092 Bootloader unable to re-lock. Need to get replacement

Hi, i recently ordered my moto x 2014 32gb from flipkart(just in case this info help). The Model number is XT1092. I did bootloader unlock and flashed cyanogen mod. It is my mistake i didn't backup my factory images. Now i want to return the phone to flipkart. I restored my phone to factory settings using RETEUALL_XT1092_5.0_LXE22.46-19_cid7_CFC.xml image. I then did fastboot oem lock...but it gave me two errors
1. sst failure
2. need to do fastboot oem lock begin.
I did the lock begin command and flashed firmware but it resulted in failure stating PreFlash Verification failure. Please I need to return this phone, I dont want to use it anymore but i need to first lock the bootloader. What should i do.

Regards
Mohit Goyal