same here called back listed as a unlisted number

This number just called me but I didn't pick up and I called back and it said not in service.

Thre was an automated voice stating I had won something from Airmiles, press 1 to claim it. I was put on hold and then a man came on and told me I won something and asked if I was over 25. He then asked me for my visa or MasterCard. I told him I didn't have one and he hung up.