HDFC Bank — Multicurrency Forex Card - Unable to login - Invalid user ID or password

Hello,

-Date of Incident : 28th Jan 2023
-Client Number : I can share this later as this is private information
-Full description of the incident : I have a Multicurrency forex card with GBP currency. Had registered online successfully and even was able to login and reload money, view transaction, and use the card in the UK at POS. But starting 28th Jan, suddenly the correct set of credentials on the same login page (https://hdfcbankprepaid.hdfcbank.com/hdfcportal/login.html) is giving me Invalid user id and password constantly.
I am in the UK, with no other method of payment, and feel handicapped as unable to load the card and perform any purchase. Cannot buy basic grocery or public transportation tickets.

Please help me urgently, will be highly obliged.