Putting away the moral and legal thing, if I put myself in Mr. Iftikhar's shoes, I'll never give you car in dec 2013 and documents of jan 2014 etc. Why? Because everyone loves his job/business, no one would risk his/her job for a customer. What would I do if you start blackmailing me? or you get me fired for forgery?
Legally he is not bound to issue your desired date's documents. And you can't do anything about it. Morally, you tried to cheat people, you yourself got the taste of your own medicine. So why cry? He's not giving you invoice of November, October, September or any earlier period. Take you car, it's invoice and move on