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There are a series of steps you can use to try to deal with these businesses in a way to at least get some resolution. You do not need to do each of these (some may not always work, for example I note in your fact pattern that you used a check instead of a credit/debit card), and some you may have already done (such as written to their customer service department (in your case writing directly to the proprietor)), but I provide you with the following as an outline because it gives you a methodical way of going through this in steps so that you can address this in a cost effective manner.
Confirmation letters: Keep written records of all communications - so if you speak to someone by phone, promptly send a follow up "confirmation letter" summarizing your conversation, who you spoke to, when, and any agreements you reached. Keep copies of your outgoing correspondence, as well as anything that you receive.
I wish you the best of luck with this dispute, and hopefully a speedy resolution.
My apologies, if she is not doing business as a part of a business entity (she is just performing this out of her home), then your remedy is simply to file a small claims case.
She should have some sort of license (beautician's license) - you can file a complaint with the state of Maryland for this - they can take her license or suspend it, but they will not recover your money (administrative agencies enforce licensing and can impose penalties on the holder, but they do not recover funds for the clients directly - you must file the small claims case yourself).
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