The limit while being less, do consider it’s a fd card, most would not really give on a secured card. Kotak is one of the few that does and maybe in future upgrades to unsecured.
There should be some validity to avail the offer, within that period you can check if you get emails, or try from the app in card overview> manage limit section or card service request> limit enhancement. Some have said via this that they never got charged fees or through the email. Give this a try it will show fees before confirmation if applicable.
Also sometimes if you do not avail their pre approved offers they may upgrade the offer.
Like for me they keep pushing personal loan, started with 30k after I opened the account last year, now it’s around 4lakh.