Monginis Cake — illegally charging for the carry bag without bill

Address:

Nimtala bus stop, andul mouri road, Howrah, West Bengal

Today i purchased a cake from monginis cake of rs. 230 & candles rs.15 total value stand for rs. 245 along with that that lady didn't asked me for the carry bag & total the amount in the calculator without a bill of rs.250. Then i asked her for the bill, so she said, she can provide bill for cake & the candle. I am purchasing a cake from your outlet so all charges are included in that for the box & bag or i supposed to carry the cake in hand? In my knowledge these thing should be provided by your side.