Reliance Fresh — customer data peddled

I am registered with DND. After visiting Reliance Fresh, Maruthi Seva Nagar, Bangalore, I am usually disturbed during my working hours by calls for credit cards, personal LOANs, etc from different mobile numbers. (Latest were from [protected] and [protected]). This is a recurring nuisance. Customers data is sold to third-party without the customer's consent or knowledge. When I contact the concerned bank about the call, those ### pretend innocence.
These stores have no sense of decency. There are other ways of making money than selling customer's data.
I am fed up of complaining to my useless inefficient service provider (read Vodafone)