Decathlon — charged for printed bag rs 15/- with their logo printed on it ? why ?

Address:

Ansal plaza, New Delhi, Delhi, 110016

Today i made purchases from decathlon for approx rs 16, 000/- and at the time of checkout, cashier charged me rs 15/- for the plastic carry bag which had decathlon written on it.
Why?

Even after i objected to cashier, he snubbed us away and said that it will be charged.

Also they write on bill it as biodegradable, whereas it is plastic look & feel bag.

Rachit jain
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