For sure its all one way.
I guess a lesson to be learned is get your phone camera out immediately. Photograph the people involved. Whether they like it or not. I don't suppose the supermarket cctv shows enough detail to identify the culprits? But you did say they were being watched inside the store too so maybe they have faces. But, no doubt, the Police would have to be involved to access the cctv footage because of "data protection". And I'm also guessing the Police won't be taking that much of an interest......