Hi,
The reason was that I completed only 1year program and even the course itself is not qualified for any skilled level (0,1,2) job. This is only reason they gave me. Additionally I remember when i applied there was no such eligibility requirement for courses duration on 6 may but yes they changed it later that the program either diploma/degree/certificates worth 16 months duration. I even withdraw my application because i knew this gonna happen but later in feb they send me request letter for fee which was just a hope for me that maybe the duration doesn’t matter.