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Called today 10/7/15 at 10:30 AM. No message left. Blocked.

WARNING--BEWARE!! These callers are   B I G   credit card criminals, known as the card service scammers! Under NO circumstances, give these lowlifes your credit card number, or you will regret it forever! It would be wise to block the ENTIRE '728 area code', as it doesn't exist- it is spoofed, and ONLY USED BY SCAMMERS.

They are calling again, it seems to come in waves when they reconfigure their calling servers.

I answered, and there was a recording "we're sorry, that is not a valid extension, please try again." and then silence.  I remained on the line for another 15-20 seconds just to see if there was anything else... there wasn't.

Just got a call from this number, but didn't answer since I don't recognize it.  Been having a lot of calls like this all week.

Called twice. I was on phone. Just tried to figure it out and got here. Not sure how to block