Someone called me from a 877 area code. I called back and an Alejandro answered.
I asked him the reason they had called me and he said he was looking for a particular person, which happened to be my sister. I asked how they were able to associate my number with her and said the information he was given reflected as much. I told them that was impossible and asked how they received my number. He refused and said they would remove my number.
I asked again how they obtained my number and he said it was given to them by some sort of service which I quickly dismissed. I told them they most likely did a random search over the Internet and came across my number. He would not elaborate further and was on the rude side.
I certainly would like to know how they retrieved my number and what gives them the right to call randomly without having accurate information. Since the number is outside my network, I will surely be charged for it.