Verification of the order can be done in the following scenarios:
a. Order quantity looks suspicious
b. Duplicate orders from the same customer
Also, note that Flipkart has strict systematic checks in place to verify the quantity of the orders before they reach you. Hence, it is unlikely that you would have received a wrong order.
However, in case you still wish to proceed with the order quantity verification, kindly reach out to Flipkart seller support with the Order IDs.
Flipkart Marketplace carries out a stringent verification process to check for order authenticity. Besides this, if you suspect the buyer is repeatedly committing fraud against you, you should report the same to Flipkart.