Bad Serviice & *********** service

Bad Service! My Name is Snowy Mosia, I took a loan with sanlam I have been dealing with them for over three years and my account have always been managed well and have never defaulted. In August 2018 was retrenched and informed them by email and send every letter they requeted and they promise to come to me after the insurance has paid my accout as I was paying protection plan for such incedent. To my suprice now lately I am getting rude phione calls from their agents saying I am in arerears my queation to them was did u ever came back to me as promised no they saiod they call me I refuse to give them my ID, I mean such a big company dont have good customer service you cannot just call a person and ask for ID numbers not even telling why you calling from where. Beside calling nothing was sent in writting nor statement showing me that the insurance has paid up this far. I need everything in black and white showing every details not just rude calls from agent telling me that I have been recorder what about them. Please help I am in a bad state and not working being harrased every day, every hour by the rude calls.