I received 3 calls, in the same week, at roughly the same time of day.  All were robots telling me I was randomly selected for a free stay at a Marriott Hotel.

416-993-4803
416-993-5615
416-993-9858

I pressed '1' on the first call to challenge them.  A woman picked up and immediately asked for my credit card number.  I asked her why she wanted that information and how she got my number.  She hung-up.