anush3070, do you dispute any of the chat text that was  posted? If not, it looks like you kept moving the goal posts on the time. It also looks like you were in over your head and had a friend bail you out. If the chat text is valid, you need to reduce the price as per your agreement as you were way over the agreed time frame.
If the coin is unusable, you need to provide a full refund as you didn't fulfill the original agreement.

This isn't anything new as you can read here: https://bitcointalk.org/index.php?topic=529244.0