Flipkart — My flipkart account has been been hacked hacker place order using flipkart pay later facility this order not placed by me

I am flipkart plus customer i cancel my return request of my order kelsey mens black sandal in this request regarding i recived call from unknown number at 11.26 a.m. & they ask for otp to complete return request.
then after some time i get lots of mail to regarding change my password & mobile number at 11.29 a.m. to 11.30 a.m. before acting i recived a mail at 11.31 a.m. about a order worth rs 69994.00 using my flipkart pay later facilty location delhi which i havent placed.
then i notice my flipkart account has been hack
after that i try to login in my flipkart account to cancel this order but i notice i cant login my flipkart account because my password & mobile number has been changed & someone request for maximum time & limit reach & i got to know that i can request otp after 24 hours
then i call lots of time to flipkart customer care number [protected]
but at customer care number flipkart don't connect my call to customer
care executive directly.
the customer care service of flipkart arrange call back
flipkart call back received not connected 2 times
then i call flipkart customer care again & again but in this due time order which i havent placed was out for delivery.
after some time i recieved call from flipkart at 1.02 p.m. i told every thing to customer care executive but between my call i get another mail from flipkart that the order has been delivered at delhi adress

i am resident of Maharashtra before i never order anything at delhi location from flipkart
now its clearly shows i am not liable to pay this order.

also how did the scammer got to know about my order kelsey mens black sandal return request
this clearly shows my data has been compromised by flipkart.

please resolve my issue