Got food to go 9-11-19. A burger. They asked how...

Got food to go 9-11-19. A burger. They asked how I wanted it cooked. I said well done. Totally pink but also fairly tasteless. I asked for lettuce, tomato, onion. There was lots of onion. I just like a little so I pulled most of it off. As I ate, I kept smelling something that stank so bad but nothing tasted bad. FInally I smelled the fries, the pickle, and then the bunch of onion I pulled off, ughh. That was it!! Like something rotted. I'm sure it absorbed the smell of something it was stored with. I pulled the rest of the onion off the burger. Fries not even fully cooked and tasteless. I only ate 3. This morning I've had to use the toilet 2X. Will NOT be eating there again!!