Never have I ever been spoken to so rudely

I received a call on Friday, 11th March at 10:02 from a Mondo call centre agent trying to sell me a telkom mobile package for airtime and data. I responded by saying i already had a cellphone contract and was only due for an upgrade in a years time so wasnt interested but thanks. He then proceeded to talk over me about the benefits and question what my current cellphone contract offers me and would not let me speak. My mother raised me with manners so I didnt just hang up on him but tried to get a word in so I could end the call politely. He wouldnt let me speak, told me I was rude and wasnt giving him a chance to tell me about what he has to offer and then when I calmly explained why I wasnt interested he responded with \now thats better\" in the most condescending tone I have ever heard. I mentioned that he is in a customer service industry and this should not be how he handles himself and just accept when someone says they are not interested and he told me that it wasnt in his job description and \"now you are trying to tell me how to do my job\" I then asked him for his name and his supervisors contact details which he gave me (turned out to be ****) ill be calling again on monday"