Review Reporting Theft

Hello, l have been a customer since 2015. I live abroad, and on the 6th of this month, l visited with two friends. We had tea and snacks. Our bill came to kshs. 670. But bill given to us by waiter was Ksh.1,970. I asked for the Manager she came with an attitude and lied that the cashier is only two days old on the job. I didn't buy her lie. Little did she know this is a second incident in two months. They are in cohort to still from customers and management of Digithu hotel in Ruiru town. The only place l could stop and enjoy a cup of tea or eat ugali.
What a pity corruption is manifested in all places. Manager, supervisor, waiter and cashier. All guilty.