Stop Calling my cell phone

I am plagued by these people, who are they and what do they want ? Thier number is (416) 915-7928

So an Indian guy calls me earlier and asks for me by name and says he's from Microsoft saying my computer downloaded malicious files.  He stuttered a bunch with his story when I was asking why MS would call me.  I asked for a number to call them back he gave me (416) 915-3536 and then I said you sound like a scam bro and he laughed and said "you're right, you figured it out" and hung up.Four hours later (416) 915-7928 calls and asks for me I tell them wrong number.I looked into this 7928 number and now realize they called me the other day.The guy who called me the second time, that I said had wrong number, it was the same guy, I remember his voice now.  He was Indian sounding, but not a thick accent like the guy who called me "from Microsoft" earlier.Anyways The 7928 guy said I was a good Scotia customer and offered me life insurance.  I was polite and said I'm broke so don't even bother.Kept trying to sell me on insurance.  Anyways I guess their second attempt was today with the Microsoft Tech (fake).Where are they getting our names and numbers from?  I heard from many places including resume/job sites.The phone I answered isn't even in my name.

who are these people and what do they want the phone rings twice and no one there

received a call from (416) 915-7928, they left no message! would like to know who is the caller?