Medlife — mrp shown in their mobile application less than actual mrp charged by them while delivery the medicine

I have placed order to medlife on 14/06 for medicine Antoxid capsule 30 tablet, MRP shown in their mobile application at the time of placing order was Rs 178/- (before 20% discount) but when i received the medicine amt charged to me was Rs 214/-(before 20% discount).They have also not inform me abt increase in MRP, also when i tried to contact them there care center are just responding that MRP has changed but same changes are not shown in their mobile application. So this seems that they are fooling their customers by showing less MRP in their mobile app then the actual MRP printed on medicine packet and when medicine is delivered to customer are charged on actual MRP..

If they are not showing actual MRP, then they shuld charge their customer on the basis of MRP shown on their mobile app while placing the order..