Why I can’t transfer from a credit card to a debit card

(1)Unlimited Loop for Credit Cards
(2)Why it’s hard to change from a credit card to a debit card
(3)Credit card payment was withdrawn last month
(4)a monthly wage
(5)no time to write
(6)There is no credit card account balance
(7)If you can’t buy anything in installments, you can never get a debit card