Big Bazaar / Futurebazaar / Future Retail / Hometown — cloth bag charge adding

Address:

103 arya nagar kanker khera sardhana road, Meerut, Uttar Pradesh, 250001

My order id-[protected], i had done the shopping of rs-5095 on 21/10/2019 from bib bazaar shopprix mall meerut.
During billing i had asked the billing boy to give cloth bag with my items so that i can carry easily but he asked the charge of rs-18, but last time no charges had been included of cloth, i told him its a free then he asked me had u ever purchased big bazzar item from any where else then i answered him why u asking this to me, he told me i am asking from where u get the free bag.
Please reply me asap why this is happening.