Welcome to the club. And sorry that you are having to deal with this, and will probably lose quite a bit of money in this regard.

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Rant: Indian passport and I ran into the same problem a month back. Things were different when I travelled to Vietnam previously just before the pandemic. You could just land and have a visa on arrival within a 15-20 minute process. Submit your passport, flight tickets and fee and boom, get a visa on spot. Now you have to apply online for e-visa before arrival, pay a significantly higher fee while dealing with several attempts to upsell you to an useless urgent service, airport fast-track and airport taxi, and then wait for 5-10 days to get the eVisa. I ended up losing close to 500 EUR thanks to this whole drama as I had to reschedule all my flights, hotels etc. Honestly, the whole experience of being offered so many paid add-on extra services and misleading urgent top-ups on the official government visa website left a very bad after-taste.