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The only time they should be hard pulling you is for CLI's. Are they pulling 6 in a month? each for the past 6 months?
Are they a current creditor. If so, they have PP for hard or soft pulls.
If not, they do not.
If you realize they have PP then you must know they do not need your authorization. Being a current creditor gives them that authorization.
6 pulls in 9 months is a bit much. Do you know what they were checking for? CLI?