As per my knowledge if u have relationship banking with IDFC (in your case Select banking) u can get your existing credit card upgraded to the variant of your relationship banking.
In my case I was issued a classic cc with only 1lakh limit but I wanted wealth cc. So I upgraded my 25k savings...
Yes they have started to roll out this feature lately.
My brother was able to link his Octane add-on card on gpay & use it for UPI transactions successfully
It hasn't been actually deducted. For some reason it's reflected as a debit transaction in unbilled. I have also experienced the same
Wait for the transactions (both ₹239 & ₹114) to get settled. After that it will be updated correctly to ₹239 as debit & ₹114 as credit