Zomato — high charges

First case: if we buy 500 ml mirinda drink is Rs35. but Zomato is charging Rs50 +47 taxes.. how 47 be taxes(attachment Z1.jpeg)

second case: instead buying one 500 ml mirinda, if we buy two 500 ml mirinda, 100 for mirinda drinks and 37 taxes..(attachment Z2.jpeg)

How come one bottle tax is 47 and two bottle tax is 37(same delivery and same tax, so tax should be increased if the total value increases.. but they actually charging normal tax for high orders, they are charging more taxes for lower orders)

Zomato is cheating the customers.. Please find the attachments