Loreal lip gloss
The price written on this product is 750 then how can they charge me 799??

I took this product from lifestyle, inorbit, malad. They charge me 799 when the rate written on product is 750. I talked with them they are saying the price of this product has been rised..so we are charging 799

My question is wen your price are changed then you should also change it on your product too..then why you have tagged rs.750 on product