Victortheo

Sympathies..
Cancellation on Thai has been a challenge ever since they went into a "bankruptcy process" apparently..( or so they say). changes are possible online depending on class of ticket bought. 
Certainly flying older planes these days ( typically their workhorses are 777 and Airbus 320/330- based on range/volume -but still the most convenient non stop to BKK within Asia. I do think there focus is really Asia and select Europe destinations where they will occasionally fly the dreamliners etc. And Service also is ok..
 

Yes, PB is still open

Look here
 

Gaggan closed as I understand. He is doing some chef tables/stalls etc as I heard, and collaborating on something with the Suhring brothers.
Hearing a bit about something on or around Soi 15 called Varanasi (or Benaras) but not personally tried. 
Frankly it always surprised me that there is no really good Indian restaurant ( outside of Gaggan's- but that was fusion and hard to get in) in Bangkok.
Everything on Sukhumvit even between Thonglor upto Pratunam ( Siam) is passable or below
The Lebua had a good chef for inhouse dishes. UK, UAE , USA metros way ahead. 

Tkx for the Intel 
Didn't know he was closed
 

One of thebetter indian restaurants you will find at frazer suites on soi 11 inthe same building as above 11
 
https://charcoalbkk.com/
They also have crazy cocktails
A good one on thonglor as well but forgot the name
Next to Mercure soi11 is also good
Best restaurant in bkk 3star michelin called Gagan is also Indian but 2 months reservation and set menu starts at 6800 thb
 
 

Westin Grande near Asoke BTS is around 5.5 k baht per night. 6.5 with breakfast. If you book early, have Marriott membership you could use points etc. And bring it down.
Great rooms, all facilities, location is quite convenient ( 7-8 min to CIB, 12-15 for Cindy's). Lobby is on 7th floor. So ask the girl to come there. And then get her through the access elevators or leave a message and they will allow her to your floor.