Harassment at Postlink, The square shopping centre.

I want to report one of your employees who uses the company telephone to harass and bully people and uses it for personal use. I have been getting calls from the postlink number and being bul****. Her Name is Cwenga Nqabeni Mazibuko and calls me mostly around 9am., I will have no choice of filling a ******** case of harassment and bullying and have the law to report to Postlink about this matter. May I have this attended