@SunnyOne78,
I am a single man. I can answer this.
First, There is nothing wrong with reaching out to a guy you are interested in a few days after a date. In fact, you should do this. If a woman texts me or calls me a few days after a date, it would make me more interested in her rather than less.
Second, These guys weren't really interested in you. If they were, they would have responded (or probably had initiated themselves). You shouldn't be hurt by that, it is life and it happens to all of us. This doesn't mean you did anything wrong, or that they were unhappy with the date. It means that after they had time to think about it they didn't think that the relationship was likely to be something they wanted.
Third, I think these guys are being a little rude with the silent treatment. I will always respond to someone who I had a date with even if just to tell them I had a fun time with them.
Fourth, dating is emotional for men (as I suspect it is for women). It is common for me that I have a great time with a woman on the date, but then the next day I don't think that pursuing a relationship is a good idea. Generally if I tell a woman that I would like to see them again while I am on a date, I am really sure that I would like to see them again (and I will ask them out again). But emotions are a funny thing and sometimes emotions on a date don't turn into anything.
I hope this is a little helpful. Dating is complicated.