Even in the US, while you may be able to delete a financial account, the company is required to keep the records for a number of years (7 maybe?)
I do not believe any such law exists in India for UPI accounts. I do believe however that Google has chosen not to allow deletion of GPay accounts for some reason other than the law.
Also GPay requires location access to work at all. So its not just payment information, it is location information along with payment information.
Seems like you have a pet theory and don't want to consider others
https://www.khaitanco.com/sites/default/files/2022-01/Data%2...
So your question is not exactly accurate. Are you expecting Google to reach into other people's accounts or other apps to delete your contact info? If I write your email in a keep note, should they delete my recording of that information?
Has Google tied pay to your general Google account, such that they are not separately managed? i.e. you have to delete your Google account, since there is only one anymore