Bata — charged more then MRP

dear sir/mam,
iam saril and i purchased a pair of shoe from bata . ameerpet , hyderabad . a.p
and the mrp on the product was Rs 799 & They charged me Rs 899.
when i asked them regarding of this they just said that the price they charged as per computer .
but the pricing on product was less then they charged ,
as now i got the product & receipt with me
and i made purchase on 22-09-09

iam just asking for your suggestion is there any chance to fight against this situation