Reliance Mart — did not get bill for pizza and more

Address:

361140

Here at moti khavdi, jamnagar
First i bought italian pizza rs. 60
And roll paneer crispy rs 30
No bill was given to me and i did not ask for it
This happened between 13.00 and 13.30 on sun 10 nov
After 5 minutes or so, while buying choco chip pastry 60 i observed that this fair guy at the counter was randomly giving bill (Not to all clients). Even for pastry, no bill was given to me
I did see him wearing any id, so could not see his name
I asked why i was not give a bill and he just assured me that i had been correctly charged
Why no bills handed over to client? Is this to save environment and trees or this is a fraudulent practice by staff?
Cctv camera footage can help