complaint

I was at zevenwacht maal to collect my proof of contract to take my phone to samsung for repairs i have insurance and i talked to the consultant ayanda he took my phones ime number and scand it in the computer he told me that my phone does not exist on there system so i asked him if i can put a insurance claim in for repairs het told me that they dont deal with the insurance anymore and that i must call the insurance myself and that its not mtn problem anymore i recieved very bad service over the years at mtn i wish that someone can help me cause mtn cant and they sold the insurance contract to me now its my problem what can i do to take further steps please help me