How can I directly contact Canadian experts ?I really don't know what can be done buddy. In this case, you should directly contact Canadian embassy or visit it if you can. Only Canadian officers or experts can tell you what could be done.
But I know one thing, as long as study permit is valid, one can go to Canada. But now it would be difficult because border officers at the airport will not let you enter. They will ask you plenty of questions and will definitely ask you why did you return and why didn't you select another program after dropping your first program. So, I will advise you to directly contact Canadian experts and explain everything to them. They will be able to guide you in the right direction. Stay positive and brave. Good luck dear.
Where they are available ?
I am in India right now.