Hi,
The "short answer" is probably yes.

You need to provide much more information, like product, month, strike and in a timely manner for anyone to be able to look and try to help you.

To give you a "for instance" .... Maybe your broker took your words at face value and entered a limit order at 500 and the exchange was happy to fill it. Then your broker added on his commission.

I put "human brokers who earn their living on customer commissions" right down there with lawyers and real estate agents - at the bottom of the sea !!!!

So, maybe you have learned a lesson on being "precise" in your terms and expectations.

I trade using an "Impeccable" on line broker and the biggest problem I have is the occasional change in exchange fee (a few pennies) on a product trade and I have to update my spread sheet where I track my trades.

Maybe you should look into eliminating the "human" and learn to do it your self !!!

Just some thoughts,
Lee