Stop Calling my cell phone

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.

It was Scotia Life Financial. I have no idea why they're calling me, seeing as how I don't use their services anymore.

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

They know both of my phone numbers. They left with a no a word message to both. I have car insurance with scotialife if it is from them, but they are not supposed to know my second no. because I never provided it to them. Very wierd.

Received more than one call from this number usually early evening on my cell phone.  I always reject the number but still keep getting calls.