Received Incorrect Itemised Billing Again

Good day, I am completely disappointed with your service. It's been two weeks now and my request still has not been resolved to my satisfaction. I requested for my itemised billing for January 2018. I then received an incorrect one for April and May on the 17/05/2018. I then wrote a complaint last week Thursday and was informed that my query will be resolved in 48 hours. On Saturday I received an incorrect itemised billing again for April and May. I don't understand what is so difficult with my query for me to be waiting almost three weeks for it to be resolved. This has now become very urgent as I need the information for a case that I have with the police. I am yet again disappointed with MTN service. If I'm not dealing with rude customer service agents then it's getting incorrect feedback on my request. No one has never even bothered to call me to understand my query because clearly no one is providing me with the correct information. I urgently need my itemised billing for January 2018, may I please have a response? Regards