There are many who have bad experiences with groomers. There is no requirement to be a groomer. Anyone can pick up some clippers and call their self a groomer. Sadly, many pet owners only bring their pets in when it gets so bad that they have to have the animal shaved down and that is what many groomers have grown accustomed to doing. It does not take any skill or time to shave a dog down. It does take skill and talent to cut and trim a dog to look a particular way.
I would look for another groomer. You are paying for a service that these people are not providing for you. There are some good groomers out there but I can tell you they are in the minority. Most of the chain stores have seriously unskilled and under trained people working on the animals so that is always a gamble. There are many people opening "grooming salons" to take advantage of the current trend for small dogs. Be careful, ask many questions, and ask if you can stay and watch the first time. Get good references and not just from pet owners who want a bathe and shave deal.
I understand how you feel. When Gracie was young I was growing out her topknot. I specifically told the groomer not to touch it. I also asked her to do other specific things to her coat. When I picked her up she had not done the things I asked for (like even out her length and around her face) but had cut her topknot!
The groomer was not there when I picked Gracie up. Needless to say we never went back there again.