very rude telemarketing

Was contacted by a Telkom representative telling me about a 75% off deal, so I kindly told her that I already have an uncapped LTE contract with them at home and I have Fibre at work with VOIP phone at work so I don't buy data or airtime for my phone, and while I was talking to her she started talking over me telling me she isn't talking about my LTE contract shes talking about my cellphone and in a very unprofessional way telling me that she doesn't believe me that I don't buy airtime or data because how do people get a hold of me and started shouting at me then when I asked for her details she shouted even more