[J_is_my_initial]

I work in a call center and we have a Help Desk. During the hrs I work, there is 1 guy that usually works till close. He has a condescending attitude to everyone but supers. There is only 1 senior that works the late hrs and he is in charge. One of the guys that sits next to him sd he always bad mouthing the reps that call him to ask questions. I know I call sometimes and ask q's I should know cause sometime i just forget. I have heard him bad mouth me when he thought he muted it. I complained to several of the supers in quality assurance meetings they told me to talk to the one higher than them. I did. Several coworkers have sd they have complained also. But he still has the position. I actually try to figure out if he is on hd before I call. My immediate senior has told me to call her anytime as she knows the problem.
I am convinced he has something on someone at the call center or above. The highest I went did say she would monitor him and apparently they did cause for about a week he got better, but right back to the same way.
ARGH!