Hello, @gloglo. It's really sad to know that the schengen viza was not issued to you at the end of the day. That was my fear from the very beginning, but I just told you to give it a try. Not to worry, one day you will get a viza.

Then I remembered a chat I had with @maryfavour as to how rigid and tight the schengen embassy is.
According to her, she has been refused a schengen visa once simply because she was not married at that time, which was found applicable to me too. I asked a lot of people and they gave the same answer as to the schengen embassy skeptical about giving unmarried individuals visa.

Please, let me correct 2 misconceptions here.

• There are 26 countries in the Schengen zone, including Portugal. Any of these countries could issue you a common viza know as Schengen viza, based on the Schengen agreement of these European Union (EU) countries in 1995. So, there is really no one Embassy that is Shengen Embassy.

• There was a misunderstanding when I told you that I have been denied viza before. It's true that I was denied viza. However, the viza I was denied was not Schengen, but Canadian. That happened in 1997, while I was still pursuing my masters degree at the University of Nigeria, Nsukka (UNN). I applied to the Canadian High Commion in Lagos for a Viza to Canada to enable me do a training course in HIV/AIDS for which I got a scholarship at the University of Winnipeg. The grounds on which I was denied viza was that I had no family ties, which was understood to mean that I was not married.
  I have NEVER been denied schengen viza. The 3 different Embassies I have applied to for Schengen viza; Germany (2012), Switzerland (2014) & Hungary (from 2015 till date) have always issued me vizas. It is also important to note that all my Schengen viza applications made till date have been from Serbia, not Nigeria. Besides, most of my viza applications have been with the purpose to attend academic conferences.
  Usually, when one applies for viza to go and study or for any academic purpose, they will not deny viza. However, the Embassy will still consider if the applicant has sufficiet funds for food, accommodation, travel insurance, tuition, health insurance etc. to cover for the period of stay in that country. I understand all of these considerations better now, having worked with our Embassy, the Embassy of Nigeria, Serbia for 4 years (2012 to 2016).

@maryfavour for @redfishpillar