Inefficient Billing/ Delivery

I am writing this mail to bring out to you about the inefficient service of your staff at various levels.On 15 Aug 24, around 12 noon,I ordered 7 items of grocery and vegetables etc vide your mail bill NumberEXN-1523149451-20240815 and paid an amount of Rs 536.16 through my credit card.After some time, I wanted to add one more item ( Sugar 2 Kg) in the same bill and proceeded as per your website.However, the bill showed an amount of Rs 614, instead of the extra amount of Rs 96 for the extra item since I alreadyhad paid for the other items. I contacted the Customer Care staff and at first, the lady who responded  said that she would verify and let me know. However,the call was disconnected.I again contacted Customer Care and this time another lady spoke to me  and assured me that she would check up and confirm the status to me. After some time she informed me that the first payment was not received by BB and hence billed again. She said that I may pay in cash at the time of delivery.
Around 3 pm, the delivery man came and put up items from two bills, one with 7 seven items, PAID, and the other with same items plus one extra item ( total 8item) and NOT PAID ( bill No EXA-1523158767-20240815)and demanded cash for full bil!! I returned items from the second bill.Apparently, your staff messed up and produced two bills one with 7 and other same 7+1 items. The Customer staff was even more inefficient and declared that my earlier payment was not received!!I request you investigate into the confusion your staff has created and spoiled the beautiful Independence Day mood of the customerI hope you will ensure that mess up does not happen in future with customers and your staff does not mislead customers.Please confirm action.Best Wishes
Smt  Saroja Kosigi