Someone from this number keeps call my house about having my ducts clean.   Could you  please stop calling me

It's Google Hangouts number.

Like the other guy said, internet says the number is owned by  Hayward Auto sales - a used car auction place in Kitchener.No message left.Try to call it back and get an "All circuits are busy" message

I got a call from "India" saying their were Mastercard offering a low rate. They asked for some personal info which I did not give and ended the call.

Its no threat to your safety. Just ignore. Scammers everywhere.

If you get a call back just say this.But dont say a name at all do this.If you live in a city say this ( CITY POLICE ) that all.If you live in a town say this ( O.P.P. ) that all.Or if you have the ( R.C.M.P. ) just say that.If you live on a Military Bas just say this ( MILITARY POLICE ) that all you need to do.But dont say your name just dont.  This will stop them from calling you back.It work thay dont call back.