The bill has been generated before you apply for installment, and you apply for installment of the bill, not the installment of a single transaction, so the bill amount will certainly not change;

After the installment of the bill is successful, the repayment amount of the current bill =1000-600 = 400;

If a single transaction installment is applied before the bill, the current bill amount = total consumption amount-installment amount+down payment amount;

Almost all bank credit card statements are like this, not what you just thought. .......