Removing semi permanent eyebrows? (Microblading) Much darker than hoped & 1 is thicker than the other!

Had my brows microbladed2days ago. I'm told the brows will fade over next weeks&this is when you go back for a top up and make any changes.But I don't get how she's going to make them match.I don't want the thinner brow to be made thicker to match,I want the thicker 1 to be slimmed down. If this can't be done,how do I get go about getting them removed?It is semi permanent make up that is expected to last 18 months-3 years.Is it worth not bothering with a top up in the hope of them fading quicker

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