Omgoodness.
I would be in total shock and mad beyond words could express.
Do you think that it was malicious intention??? I would agree with not paying or go in when the owner is there and explain the situation with before and after pictures plus show the owner what your pictures looked like as the example. I think you should get a full refund plus never take your babies there again.
I found a wonderful groomer for Buddybear
Wishing you get a groomer next time that cares about your babies and wants repeat customers