Sandisk Extreme 480GB SSD on Macbook Pro 15 inch mid 2012

If you still cannot get it to work, there may just be a firmware issue with the SSD and your relatively new MacBook Pro. 

Firmware incompatibility issues are not that uncommon with SSDs, even with brands like the Crucial M4. If you still can’t get it to install, I would wait for the latest firmware to come out before pursuing warranty replacements, since you have 3 years and NewEgg won’t take it back.