Flipkart — unable to change the mobile number in flipkart

Recently i have changed my mobile number to another number and so wanted to change it from flipkart to the new one but it requires otp from old number as well in flipkart but i have not the number so it unlikely impossible to get the otp from that number so i can't enter the otp from old number and that's why i am not able to update the number in flipkart. It is requested to the flipkart please provide assistance with this regard as soon as possible.
Old number is : [[protected]]