Angel Broking — Wrong Brokerage charges @ 40 per lot against promised 20 per lot

The angel one is charging wrong brokerage and also there is no option where in i can check the brokerage charge from the report sections. i opened an account only on the basis of their advertisement and details given on their website that they charge 20 per lot irrespective of the amount. but that is not the case they are charging exorbitant brokerage that too with out the knowledge of the customer. i was able to find it only when i thoroughly checked by contract notes