You can approach them showing this page.I am an old customer of icici since 2017. Had a very basic bare minimum savings account. I never did anything and got upgraded to Privilege. For me, it's same as basic account for most of the things. Actually there's nothing premium about if you ask..
Also,
I have LTF sapphiro cc with 5L limit. Anyway i can get upgraded to 0MAB wealth?
I'm afraid they may say its old and expired or something to escape