The Sales People will cause DSTV to die a slow death. RUDE

The call centre has now phoned several times trying to get my elderly parents to upgrade. Their number is not listed with DSTV anymore, mine or the office number is listed with all companies so the lady has been speaking to our PA. After 3 separate calls and of stating that they are not interested the poor PA gave me the phone. I tried to explain and tried to explain that my parents are basically immobile and that they dont deal with any businness any more. the Agent insisted that she just spoke to my mom that told her to hold on for my dad. I responded that no it was the PA - Chantel and that she handed me the phone. She actually got very argumentative and I was trying to explain the situation and there was not angry or hostile at all but said that I just want to explain so that I can assist and she put the phone down in my ear. If I just had her name...... I run a company as well and if ANY of my employees dared to speak to someone like that they would face a disciplinary. Now you have people that want to push for sales but has just soured my whole idea of DSTV - my parents have been loyal subscribers for more than 30 years. Now after this interaction I will ensure that they move to a different much cheaper option. Why stay loyal if a sales agent cannot even have common decency?