Reliance Market — requirement of pan card

Address:

Solapur, Maharashtra, 413215

Yesterday i visited reliance market solapur.

The bill amount was more than 13000.00, during billing i was asked to produce my pan card as the bill amount was more than 5000.00 and i was paying with credit / debit card.

I was told that pan card is not required if paid by cash.

What is this logic? I dont understand.
Why should the customers produce their pan cards if payment is made through credit or debit cards that too for a bill amount of more than 5000.00