Agent's bad attidude towards client

On Wednesday the 13 April 2016 at 13:29 an agent (male, didn't get his name) called me from Telkom, at the time I was very busy at work... ironically I am an Senior IT Support Engineer at 1 of the biggest companies in the Eastern Cape and actually deal with Telkom quite often. I then told him to phone me back around 5PM (after work) as I did not have the time to speak, as I was busy on the other line with a business critical issue for my one of client . The agent called me back at 17:10 and I took the call. He offered me a tablet package deal which I qualify for, unfortunately after hearing his offer I declined as I already have a cellphone contract and Wi-Fi at home with TELKOM. The agent absolutely went off on me, telling me that I am wasting his time and that I should have never asked him to call me back. I am VERY UNHAPPY and he had no right to be upset with me, last time I checked him calling me is part of his job... by no means was I rude when I declined the offer but feel that he should have just accepted or told me to perhaps think about the offer and to contact Telkom if ever I was to change my mind. Just to add I know all about service delivery, PLEASE ESCALATE THIS!!