Marshalls

I was returning an item to exchange for a different size. The associate did not acknowledge me in an acceptable time she continued talking to another associate before she acknowledged my presence. After I returned the item I purchased the correct size and was leaving the store when I observed the clerk waving the item I had returned in the air and laughing with the other associates out loud in the store. I almost stopped at that time to speak to the manager but I was so upset and embarrassed that I decided to just call from my car. I told the manager what had just happended and she said she would take care of it. She did not ask my name, take down my number, or ask if there was anything else she could do for me; a letter of appology could have been at least offered. This is rude behavior and I don't have to shop there and I wont