MTN South Africa

I am now trying for a period of time, since February 2021, to try and get a document to prove that there was insurance deducting from our telephone account for which I did not sign for. There was correspondence not telling me what they need . I only had a copy of my contract but could not get a copy of an invoice to proof that there was such a deduction. Every week .. for 6 weeks now I got to phone and ask if I could be supp**** with the document ... I get a reference number with a promise that I do have to wait for five working days, I may then, if I did not get it , phone then and ask again. This week is the 6th week that I had to phone after a promise last week that the people working with this issue, knows about me, they have seen my request and the document will be send to me that that day, that was on Wednesday, last week . . can I say ... no document was received . This request was even send to the director, I do not know which one ... all done with reference numbers. This morning again I phoned and the same story, wait 24 hours ... PERHAPS SOMETHING IS GOING TO HAPPEN NOW, I got a new refence number. I really do not know where to go for help because you cannot speak to any senior person at the company your call are directed to the call center. I do not get any help from any person working at the company, only promises.