if ur boss is not happy with ur performance or he is just one of those who are difficult to understand, then he definitely won't give u NOC, if he wants to get rid of you that quick, then he should purchase ur ticket. i still believe it is better to suffer in ur own country than to be treated like shit in a foreign country. if he won't buy u a ticket, then that means he don't want to get rid of u. always stick to ur guns, let him pay for ur ticket, he's the one who's dodgy, not u.