Big Bazaar / Futurebazaar / Future Retail / Hometown — error in the receipt total

Address: Chennai, Tamil Nadu

Hi,
I shopped in big bazzar in express avenue, chennai. There seems to be an error in the total amount calculated. It is mentioned that the price given for each item us inclusive of all the taxes so why is the total more without giving any reason?
When we bought huggies nappies 38 pack, the sales person working there said if you buy one other is free. Why did they mislead us when you have made us to pay for both. This is not correct. I am very disappointed with this service and dishonesty.

Truly
Gita