Hello, I'm reaching out to express my concern as a South African citizen

Hello, I'm reaching out to express my concern as a South African citizen. I've been receiving persistent and rude calls from TFG, even after declining their offers. Recently, I was insulted by someone who contacted me, and I'm determined to put an end to this harassment. I expect to be treated with respect on my own phone, and I'd like assistance in stopping these unwanted and abusive calls.