Myntra.com — Myntra credit

I have myntra credit of more than 10k which is expiring on 30.11.22. I tried to order from Myntra but it requires OTP on the registered number. My registered number is not wokring as i am outside India. Ibtried to contact myntra multiple times to update my number. They will say we will get back to you but they are not giving any oroper response. Earlier also they have keept my rs 3000. This time it is more than 10k. I am working hard to earn this money. And Myntra is not responding to change the number.