MTN Cold Call Centre Rudeness

I am continuously called by MTN representatives telling me I have been pre selected for a MTN contract, to which I reply: Can you please remove me from this calling list as I already have a contract with MTN. My understanding of the POPI act is that these representatives are permitted to call you once and if you asked to be removed they have to stop calling you. Today I get another call, this time the representative identifies hmiself as Romeo using number ***, so I explain my story to him as I did last week to the other MTN representative. This time, however, Romeo just put the phone down in my ear. What utter disrespect your customers are treated with by people representing your company. Horrifying as it takes less than two minutes to be polite; but then I guess it only takes a second to be rude and put the phone down on a customer.