Request for itemised billing documents disregarded

I have requested itemised billing statements from MTN several times via phone calls to the call centre and from the website for my other cell phone contract ***). These statements cost R21.50 per month requested and to date I have received nothing. Just endless hours of time wasted on trying to obtain these elusive statements. This week I was assured that they would arrive in my inbox in 2-24 hours as they need to be sent by the credit controllers. I will not keep paying for nothing received and I urgently require these statements. I have already lost money due to not bring able to claim back my call charges from work. I want this to be resolved ASAP!