Get three calls from them EVERYDAY! I have blocked them so it doesn't ring when they call. The first time they called they asked for me and said it was from Mastercard, I said that the person was not available and blocked them.
I have been getting 1-2 calls per day for the last week from this number. I don't answer and the only voicemail they leave is someone saying "Hello" 4-5 times before hanging up - obviously a Call Centre