Flipkart — Updating registered mobile number

I have created my flipkart account two years back with a mobile number and email, but now the mobile number has been lost and deactivated. I usually give my new number when ordering a product. Now i would like to change my registered number.

The main problem is when i tried to update my new mobile number, the OTP are being sent to both the new number and the old number. I got the new number otp and account password, but the otp of the old number cannot be entered as i lost the number and i don't have it. This is making me unable to change the mobile number.
When i tried to call the customer service the number shown to recicve the call is my old number which makes the situation difficult
Please do suggest me to update my new mobile number to my flipkart account.
My profile name Sreerag RM
My email id: [protected]@gmail.com
my old no:[protected]
my new no:[protected]