Flipkart — Phone No. Change request

I am a Flipkart plus member for about 3years and I have deactivated my old phone number and someone else got that number from the company. Now these days I am seeing that person is using my account modifying my wishlist and even ordering on his address.
I tried to get in touch with the team but the call request was going on the old phone number.
I tried updating the no. as well but 2 OTP is required for that. Kindly help I am suffering for the past 1 year.