What should I do about my experience with my AD

[Two81pb]

I would like some of your input with this situation.
Last month (11/15/12) I dropped my fathers 1680 sub off at the Ad to get serviced, I was told the turn around would be exactly a month. The due date written on my receipt was 12/15/12. 3 days before it was supposed to be finished (the 12th) I called to confirm it would still be ready on time I was told "yes sir our watch maker is always right on with his due dates" so come the 15th I drove up to the store and sat in the horrid mall traffic just to find out that it was not ready, the lady gave me the excuse that " the watch maker was watching the time to make sure everything was ok" as mad as I was I bit my tounge and left the store. This morning I got a call from the AD saying that they were waiting on a part and it should be in today and my watch ready.
Frankly I think this is just bad costumer service, hell tell me the truth don't give me 2 different stories.
What should I do when I go into the ad after work tomorrow? Just thank them and take my watch? Talk with the manager and let them know how displeased I am? Ask for a discount?