An update on the "promise" of free tickets made by Citi when trying to get me to upgrade, without too many details:
1. Card arrived without any free flight vouchers, so I emailed them asking about them
2. Got a stock response of "that's only with new cards, not for upgraded cards" etc - from the same guy who had promised it in the first place
3. Replied with screenshot of the promise made by the same guy, asking for explanation
4. Over a week went (with an automated response mid-way stating "we need more time to resolve")
5. Got a response with apology and that they'll never do it again, etc - but they can't "accommodate my request"
6. Responded with another email, and also gave an option of crediting PM miles to my account instead
7. Another wait of over a week (with two automated "we need more time" emails), and now they have sent me the vouchers. Oddly the response said they're emailing 2 vouchers, but the email containing the vouchers has 3.

Overall, I had to send a few reasonably-strongly-worded emails. And wait for almost 3 weeks.

The experience of dealing with their support wasn't that great - the guy kept giving inaccurate, inconsistent messages throughout (and they were copy/pasted from stock responses). Not sure if Citi is trying to match Indian banks in terms of customer service standards.

But at least they did send the vouchers. And I hope at least 2 of them work!

Now to see which of the major metro routes have base fares below INR 1500...