ExpressTech Systems interview questions

A company that makes 4 rounds ( including final hr round ) just to say they are not looking for this position. Recently had my interview, the interviews went good. Later after clearing all the round and discussing the salary and postion. I got a call after 2 r 3 days stating "WE DONT HAVE BUDGET AND ALSO NOT LOOKING FOR THIS ROLE" I mean i had agreed for there lowball offer ( 10k for a PHP dev freshers ) with no extra benifits. They are simply playing with freshers I think. Don't know ?? Why take interview that to 3 to 4 rounds just to say we dont have budget/ not looking for postion ...