First of all, it may be because you have incurred extra expenses or consumption when using the transportation credit card. This may include, but is not limited to, expenses incurred by using transportation services, such as ticket purchase, recharging, refueling or parking.
Secondly, it is also possible that you have accumulated a certain amount of traffic points or cash back over a period of time, and these points or cash back may be deducted from your account, resulting in an increase in the amount of deduction.
In addition, it is also possible that you didn't pay off the debt on your credit card in time, resulting in overdue penalty interest or other related expenses, thus increasing the amount of deduction.
To sum up, the reason why the traffic credit card was deducted more than 400 yuan may be due to the use of traffic services, deduction or cash back points, overdue penalty interest and other factors.
If the problem information is insufficient, we can assume that you have used the transportation credit card many times and the consumption amount is high, or you may have participated in an activity or promotion, and you need to reach a certain consumption threshold to enjoy the corresponding discount. The above is only a hypothetical situation, and the specific reasons need to be determined according to your actual situation.
Supplementary information: Traffic credit card is a kind of credit card product specially designed for traffic trip, which can be paid in public transportation, highways, parking lots and other related places, and enjoy corresponding points or cash back discounts. Different banks or credit card institutions may provide different transportation credit card products and preferential policies.