Then the quota must have been occupied somewhere. If the total amount is 5,000, if 2,400 are used up by swiping the card, there should be 2,600 left. Now it is found that the available limit is only 1,600. Then you can call the 400 customer service number on the back of the card and ask someone to check specifically why the limit is occupied. It may be that you have made other purchases or withdrawn cash on the same day but have not yet recorded it in your account. It may also be that you have booked air tickets or paid hotel authorization deposits, which caused the credit limit to be frozen. Another possibility is that you have applied for installment payment business. The unpaid portion of the payment will occupy the credit limit, and the available credit limit will be restored month by month as the monthly repayments are made.