To confront or to not?

So I just found out that my nail lady has been overcharging me by at least $15 every nail appointment which is every two weeks. I SWEAR by this salon and their work but that’s way too much money being practically stolen from me. Should I confront the business with pretty much no evidence other than my word? Or should I just change nail techs? Part of me wants to keep receipts and take pictures of my nails to show there was no reason to charge me extra then ask for my money back and call them out, but part of me wants to just get over it, take blame for not realizing it sooner and just change nail techs! Help 😩