Flipkart — Mobile number change without otp from old phone, lost my previous number.

I have created flipkart account few years back with a mobile number few months ago i lost my mobile phone and the number.

The main problem is when i tried to update my new mobile number, the otps 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 dont have it. This is making me unable to change the mobile number.
Please do suggest me to update my new mobile number to my flipkart account.