Poor service from dispensary manager

I need to report poor service from Clicks Mayville, she is the dispensary manager at the medicine department, she doesn't care about people recieving poor service from herself as she is slow and don't care about people waiting to be helped. She is giving the idea that she is irreplaceable, het name i think is Elize. She will not attend clients promptly and do things very slow. She is annoying the clients that needs to be helped. Please rectify this. Regards