Flipkart — Flipkart Account mobile number changed and around Rs. 9000 paid via Flipkart Pay Later

My Account was first inactivated then a call came from a scammer and asked me to tell me the OTP to verify the mobile number and then they changed the mobile number. But since they couldn't change my E-mail ID, I am able to log in to the Flipkart account. But those scammers are ordering from Myntra using their mobile number and paying for it using my Flipkart Pay Later. So, I log out from all devices and also deactivated my account but they are still able to log in to my account and yesterday, i.e. 18th August 2022, they ordered again from Myntra and paid by using the same trick again. I don't know how they are able to reactivate my account and also change my password. Now I want to close my Flipkart account as a whole or at least close my Flipkart Pay Later option. I will be happy if any of the above is done/resolved as early as possible.