Has anyone had problems using citi 2% card or any citi bank card? My mall the first time work perfectly, the 2nd she said it might not go thru because is a mastercard, and third time I went it didn't go through. When she made the verification the first time I went she said she doesn't know why problem system is down, the 2nd time I went she said that she can't take citibank cards and that she doesn't know me, she apologies I feel like after my first purchase they block my card....