Well my friend and I are voting with our feet and wallets.
Here is what I paid for my manicure on 7 Sep - including the cc surcharge.
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And here is what I paid yesterday for the exact same manicure.
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They had a big sign up in the shop advising their compliance with the surcharge ban, but basically they have hiked the prices by ~10%. There were no signs or other info about the huge price rise. So we did not find out about it until after the services were provided. I was annoyed, but my friend was incensed. She is scouting new places for our monthly nail treat. She said, even if it costs the same elsewhere, she will not go back to this shop. Such a pity as we have been customers at this locally owned small business for almost 10 years now, but they are surely taking the p1ss doing this.