Incessant harassing phone calls

Mi/way is the worst company for spam and **** calls. Since 2019 I have been receiving calls trying to get me to buy into their insurance. Blocking the number each time has not helped. Las week I received another such call, so I said to the lady ok give me a quite but I can assure you I will not change my insurance. At the end I said no, and goodbye. This morning I get yet another call from some lady saying she is checking to see if I am taking up the insurance offer!! The more I explained that I was not interested, the more she said that she was following up on my "request"! I don't think this is the last call I will get no matter how many times I block the numbers. Now, more importantly, people who work on these call centres or in companies need to be taught telephone etiquette. You do not start a conversation with "how are you", "good morning how are you", and many other variations, but THEY NEVER IDENTIFY WHO THEY ARE AND WHO THEY ARE CALLING FROM. That is just plain rude, invasive and unprofessional. I know it appears to be a very South African thing, but if someone starts a conversation with me like this and I will either hang up or tell them to learn how to contact people. MiWay needs to get their act together and stop harassing people.