Rude and unable to help.

What a terrible experience, the app gives you an option to change your order. I changed my order almost immediately after I have submitted it. I received both orders, when I phoned to complain about the double order I was told they are aware that this option gives problem and now I have to take the items back to the store.

I am told that I have to take the items back to a store! How has this become my problem? If I wanted to go to a shop then I would have gone early this morning.