DENTON, Texas--(BUSINESS WIRE)--Sally Beauty is updating its customers today on its ongoing investigation of unusual payment card activity and on efforts to provide support to any customers who may have been affected by the incident. “We believe it is in the best interests of our customers to alert them that we now have sufficient evidence to confirm that an illegal intrusion into our payment card systems has indeed occurred. However, we will not speculate on the scope of the intrusion as our f