OverCharged on MRP on a cold drink and shawarma

I purchased 3 shawarmas and one big cola (black coloured cold drink) from Kesas Shawarma, Tilak Nagar, Mumbai, Maharashtra. At the time of billing, I was charged Rs 10 extra on each of the 3 shawarmas and Rs 9 extra on the big cola, over and above the price that should have applied. This amounts to overcharging on all four items purchased in this one transaction. I request the consumer forum to direct Kesas, Tilak Nagar to refund the excess amount charged on these items and to ensure correct pricing is charged to customers going forward.