******* Agent laughing while I was frustrated

I called vodacom yesterday on the 1st of June seeking for assistance and was transferred to the visa pay department and a gentleman answered and kept on laughing in the background while assisting me. I felt that she was very unprofessional and repeatedly laughed while I was talking. I have never been treated this bad by vodacom ever. I tried to remain come even though I was very frustrated and ended up dropping the line. I bought minutes with 200 MB and only data was allocated but I guess he was laughing and made me feel less important of a customer and I am also considering canceling my contract when it needs. He was a disgrace and doesn't deserve to help customers with that attitude