Great Clips review: screwed up my hair

I have been doing hair cut in the same store for last 2.5years. Today I asked
for the same style as last time. The hairstylist literally screwed up my forehead. They used clips for forehead before I could resist. They just said its too late to change and tried to put the blame on me. How can they do it for a regular customer? I just can't comb my hair Atleast for next 2 weeks. Never expected such a service from Great clips.