your call center agents are horrible to work with

I have been waiting for a delivery from them for weeks and today when i finally got a call from them, the agent referred to me as 'MR'. I am female by the way, so when I told him that I am not a 'MR' but rather a 'Miss'. (Which any person can hear as i have a very girlie voice.) When I told him nicely to refer to me as Miss, Lo and behold, he hung up. I called them back to tell them about their behaviour but as i was reading out my reference number...guess what? The lady hung up!! this is no way to treat customers. FNB should really think about hiring another courier company!!