Bikanervala / Bikano — extra charges more than mrp

I went to bikano cafe on 9oct 2018 at ferozepur cantt. Order some snacks with cold drink. When i paid i found that i had to pay more than mrp of cold drink. How it can possible according to government guide lines (Consumer forum) no one can demand more than mrp price. When i told to your dealing hand mr. Mukesh he ignored it. It is not good for costumers