Applebee's: There's No Place Like The Neighborhood!

I took my wife out to dinner a couple of nights ago to our local Applebee's.  We've eaten there many times and have up until this visit had wonderful service and outstanding food quality.  Usually there's a manager walking around asking everybody if everything is tasting okay or if there's anything he or she (there's been a couple) can do to improve our dining experience.  This time was different though.  It was very busy, but our server Jaime did an excellent job checking up on all of his customers, keeping drinks filled, and making sure everything was okay.  My wife ordered the riblet/chicken platter and I ordered a bacon cheeseburger.  When our food arrived it looked AWESOME!  My wife started eating and enjoying her meal as I turned my burger over to remove the toothpick and discard all the healthy stuff (you know, the tomatoes and lettuce) and douse the burger with some ketchup.  This is where the problem started.  I noticed there was mold all over the bottom portion of my bun.  So the next time Jaime came by I asked to see a manager.  I told him he was a great server it was nothing about him (I didn't expect him to pick up my burger and look underneath), I just wanted to inform the manager so she could let the kitchen staff know to check their stock and get me a burger without mold.  She came back within a minute with another burger, informed me she stole somebody else's burger and they could just wait a few more minutes, and told me it was just overly hot in the storeroom where they keep the buns.  I said it's not a problem, I just didn't want anybody getting sick and thought they might like to know so they could check their inventory or at least have the people in the kitchen keeping an eye out.  I work in food service and I don't like people who just holler and complain and expect you to make their world a better place by letting them vent their frustrations on you.  So even though she seemed to dismiss it as a farce, I just let it go.  Jaime brought us our check and it really confused me.  I was expecting to pay for mine and my wife's meal, no problem, because they fixed the mistake.  But as I looked over the receipt it showed my burger being charged and then taken off, but when I added up the total of what that should have been it didn't add up.  Even though the receipt made it look like my burger was free I was still being charged for it.  Again I asked Jaime if I could speak to the manager (who I found out through my wife asking the hostess that her name is Desiree.)  When she arrived she said it was a mistake and they would take care of it, they really weren't trying to charge me for the burger, but they had already run my debit card, but not to worry they could still pull it back and refund my card.  I said okay, thank you.  Then they brought me a new bill to pay but didn't bring proof that the other had been reversed.  I couldn't believe it, so again I asked Jaime if Desiree would mind bringing us a copy of the cancellation.  Like I said, I hate being one of those people in a restaurant so I never once got mad, demanded anything for free, or created a scene.  Finally they brought a copy showing me a duplicate bill of the first one, not a cancellation!  So again I asked Desiree to please show me something so I know I'm not getting charged twice for our meal.  Eventually she finally brought out a copy of something resembling what I wanted and we were able to leave the restaurant.  I really like Applebee's,  the whole thing was just very frustrating.  The service has always been great, this is the first time the food has been messed up, but I can't bring myself to stop thinking that she didn't even tell anyone in the back, she just grabbed me another burger.  I hope nobody else got moldy bread and didn't notice it, if I hadn't of turned mine over first (which I usually don't) I would have eaten it.  Ewww!