PVR Cinemas — Ticket price

Pvr cinemas executive are charging about double what is the updated price for tickets at cinema hall. Ticket price is 99 for the morning show and they are asking for rs 179, asking for convenience and other charges and making double, I don't understand how?? However I hav experience with PVR many times there is no charges at the hall window while booking except the amount of ticket. This is completely unethical to ask for something which is not explainable.