They call me about 2-6 times a day. Disconnects as soon as I answer, and invalid number when I try to call back.

keep getting calls from this number no response when answering

this number has called several times over the last week! I finally answered a 10:45pm call and I couldn't hardly understand the man. He asked if I still had the same address and the card I had been using ending in xxxx was eligible for a gift card. I said, "I'm not interested" and hung up. They have continued to call me all day today. I have answered again but nobody will say anything now.
We are going to call our cell phone provider tomorrow and have the number blocked,

called 15 times over last two days

I've had several calls from these people and they had the last four digits of my card number and would not identify themselves. Had very heavy accent and actually left messages as if they were my credit card company. These people are definitely SCAMMERS  !!!!!!!!