Have you checked on what HASS fills when changing the ATF by themselves? As per the owner's manual, it says "ATF SP-IV with required quantity of 7.1L".
A common issue with Creta. The Rear Right Power Window in my car isn't functioning for the past 6 - 8 months. Not that it has bothered me so far as only 2 occupants are there maximum in my Creta that too only on weekends else it is only me driving it.
I presume that the Power window motor has gone kaput. New one costs ₹3,200 AFAIK. Will change it soon though.
There was a receipt, under the armrest, of the same power window being repaired. The cost written was Rs 800. This was fixed almost a year ago by the previous owner, as per the receipt. Was done at an FNG. Again, it is just me who is driving the car and other seats usually aren't occupied. A solution to this, as suggested by a friendly garage owner, is that we use all four power windows twice in a day so that the motor remains in its prime.
As for the HASS and ATF, no, they didn't mention any details. Claimed that 10 litres will be used, with the 3 extra for flushing. A day's job. FNG said that it will be a Rs 15k job and will be done in half a day. One HASS suggested to let the fluid be as it is. The more you open and check, more the chances of dust getting in and ruining it.
The front door rust is prevalent. As a stop gap, the garage used sandpaper and primer and then painted it white. Not sure how long it will stick before the rust starts manifesting itself again. Since I have a sunroof to deal with, that part was also neatly sandpapered and then painted.
What did you do to dampen the sound more? My car gives slight vibrations through the driver's seat and front door panels. Happens at idle and when gear is engaged (higher). Not unbearable but the OCD in me tells that this has to be fixed. HASS says it is normal for diesel engines but I remember driving a diesel Creta for 6 months in 2016 and it had run 88k kms. No vibrations and the engine was dead silent as well. Maybe other members can also chip in with suggestions. The engine mounts were replaced a month ago when I got the car