McDonald's

Ive been to this Mcdonalds alot because its not to far from my house and I have a problem everytime I go. I try to say to myself maybe it will be different this time and it never is. I went to the Mcdonalds on 52nd and wadsworth in denver co at 11:00 August 9. They told me they stop serving breakfest which was not a problem. So I order a Mcdouble no onions small fry and small water. I got my food at 11:10 and of coarse like always they put onions on my burger, I was thinking they should know me by now as many times they have put onions on my burger when I always ask not to. So i gave her my burger back and told the cashier I didnt want onions on my burger. She said ok and I waited, waited, and waited, finally a customer said to me you was here way before me how did I get my food before you. I said good question I ordered at 11:00 and it is now 11:30 the customer asked where is the manager and complained for me. I said I want my money back im not even hungry anymore. Guess what she told me Im sorry I didnt see you there I gave your burger away.Thanks to store number 15661 in Arvada Co 5235 Wadsworth blvd for almost killing me everytime I order food from them because Im allergic to onions. There customer service has never been good either I will take this up with someone higher up.