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Ditto to the dispute suggestion. However, look at the age of the TL in relation to your AAoA before doing anything. DW was in a similar situation with her dad's Citi TL. He kept it at 95% utilization and because of the sizable CL, the best DW could do for her utilization overall was over 90%. So, we removed it and her score dropped. Why? Because her AAoA went from 5 or 6 yrs to 2 yrs.
Mix of credit should be considered too. If you have other CCs outside of this CC, then this isn't anything to worry about.