First of all, it will grow back.
. I think all of us have had a bad cut. Mine had chicken leg look in the back and the groomer left the front legs long.
I was upset too! But it will grow back.
But I do think you need to let them know you were not happy. They should at least refund you what you paid.
I'm sure your baby is still adorable! Hope you can find a groomer you are happy with!