Same here...I looked it up and found the following:
Spoofed Numbers: Caution, 407-000-7428 is a "spoofed" number, which means that whoever called you "tricked" your caller ID to display an incorrect phone number. Telemarketers do this so you cannot complain,
Got a call from this number today. Spoke to them and they tried tell me that they could lower my interest to 0%. Yeah, right! Then, proceeded to ask for my Credit Card number and address.
Again...Yeah, right. I asked for a number to call them back and they would not give me one. I figure if they don't want to be contacted, it means they don't want to be discovered either. SHADY!!!! Never give your credit card number to these people.