The number is from Global Collections Canada. They are most likely calling about a file they with you. If you haven't paid a bill to a company, it's probably a good idea to answer the call to clear up the debt. If not, answer it anyway and ask why they are calling you.
if you owe money to a collections agency like global and can pay, call them.
if you cant, get a call blocker or even better if its an amount that is big and you unemployed or cant pay, get a lawyer and declare bankrupcy. if you owe alot, it will bring you peace of mind if you just declare bankrupcy, and you can build your credit back and borrow again after 6 years.