Harassed with phone calls

I have been inundated with calls from your sales assistant Vusimuzi Gumede. I would like to name and shame this fool who continuously calls from private number and never talks or responds, and then hangs up. I know it is him calling/misscalling because I asked someone to answer the 15th call of the day on my behalf, and he then spoke. Please sort out your staff, track his call register. Even if I was interested in your, I now am not because of this employees mentality.