MRP se jada rate par products sale

Location/place: HINGOLI

Name of company/service: VRUNDAWAN RESTRAUNT

dear sir,
23/06/2012, ko m or meri friend ne vrandawan restraunt se ice cream kharidi. hamne do ice cream khridi jinka MRP tha rs15/- aur rs 30/-. lekin restraunt se hame bill mila total rs 55/- ka. unhone perICE CREAM Rs 5/- jyada liyaaur puchne par kaha ki cooling charges hai.
kya MRP se jyada price lena sahi hai aur agar nahi to hame kya karna chahiye.