Guys,
Credit score has nothing to do with the immigration, I have not heard if they ask this in an interview, but just in case if it is asked, it will be because just to measure your net worth not that you have to pay the debts and then immigrate. CIC will not act as a collection agency for your debts.
And what about the debts in the countries where they cannot be tracked such as no social security or credit system? How they find out your debts, you can say I have no debts and they have to believe it.