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antique said:
LOI is the letter states your application has been approved its like a table mentions the expiry date of your visa and everything and UCI number will be mentioned also, you should carry this along with other documents it's important

The letter states that the visa has been approved and there is a 1 row, 3 column table stating the type, document no and the permit validity. It also tells that this itself does not facilitate an entry into Canada, but is to be presented to the visa officer along with the passport. Is this the one?
 
Throughout all this, I found there are no such issues in Canada, only our Indian agent and immigration people advise these unnecessary things to thier clients. No one can stop you from coming to the country once you get the visa. Cheers