Flipkart — Change of mobile number from Old/lost one to new mobile number

Address:

NEAR ORAON HOSTEL LOHARDAGA ROAD GUMLA

I'm unable to change my default Mobile number in my Flipkart account because my previous number is inaccessible now. Whenever I try to replace my new mobile number. OTPs are sent in both mobile numbers but since I don't have access to old number I can't update. True several times, its frustrating. I request to change my mobile number in my Flipkart account as soon as possible.

My Flipkart account registered email : [protected]@gmail.com
Old/Lost mobile number : [protected]
New number i want to be my Flipkart associated mobile number : [protected]