Flipkart — regarding phone number update

Address:

Flipkart Internet Private Limited, Vaishnavi Summit, No 6/B, 7th Main, 80 Feet Road, 3rd Block, Koramangala, Bangalore – 560034, India

I have a flipkart account with flipkart plus active. I am a regular customer.

I want to update my mobile number on the flipkart account, i don't have access to the old mobile number. This doesn't seem possible.

I tried contacting flipkart customer support but that also seems impossible. The number given on their website is always busy. Their old customer support id [protected]@flipkart.com no longer works. I am at a loss as to how to reach their customer support.