You mentioned Indian rupees.
On the Apple (India) site, I no longer see any listing for Apple One. Even when I do a search and find a link for what appears to be the Apple One (India) page, following that link redirects me to the iCloud+ page for India. There is a change to iCloud+. Subscribers to iCloud+ now get access to Apple Arcade, and to non-third-party-content parts of Apple TV, for no extra cost.
I believe Apple rolled out that change to about 100 countries in September 2026 – although the U.S., Canada, Great Britain, Japan, and a lot of Western European / EU countries are not among them. On the U.S. site, iCloud+ doesn't include Apple Arcade or Apple TV access, and there are separate Apple One plans.
Maybe the timing of your subscription to Apple One was such that you got caught up in some glitch around Apple's decision to stop offering Apple One plans in India, and to include extra stuff in iCloud+ plans in India?!?
It's a possibility that you could at least mention when you talk to Apple Support, in case it helps them figure out the issue.