Customer service

O.K. so, I go to my favorite pizza joint.  Now, get this I have been going to this restaurant for over 30 years.  I used to go there for the spaghetti special when my daughter was a little girl.  Tonight was Lasagna special night.  I figure why not haven't been in a few months.  I order the vegetarian version.  I wait for my food to arrive after eating my salad.  Looks good I think to myself.  So I take a bite..sauce lots of cheese and SAUSAGE! What! I ordered vegetarian.  Hmm so now I am trying to get the attention of one of the three people that work there.  Finally, I get one.  She seems nice and of course takes it back to the kitchen.  I wait a while and she reappears to offer the new guy screwed up the order thing.  Then she brings me the correct one.  I eat now I am expecting either a complimentary desert or a deduction from the bill.  To my surprise neither happened.  I did not even get the usual mints.  I leave and now am thinking I will be calling the owner tomorrow.  I personally do not care if the waitress, cook or the one that brought the entre' to me messed up the order.  Thank me for my patience and make me want to come back.  Don't act like the customer should put up with errors.  Just my thinking that in a day and age when businesses are failing in alarming numbers that no business would want to chase away customers.