lulu hypermarket - collecting more money from customers

am purchasing juice from lulu mall by swiggy app ,the total amount of the product is *** rupees.
strawberry milk shake** is **
mango milk shake is **
vanilla milk shake is **
total *** rupees
and the give discount of **%
then i pay ** rupees for that
but the actual price mentioned in product is ** rupees for each juice .so i loss the amount ** rupees or they collected money by publishing fake advertising