Requested Statements 3 times, still not received

Hello, Please refer to Ref *** and REF ***.<br> <br> I called MTN a while back and asked for INVOICES for my account from June 2015. Did not take a ref as I expected the request to be completed. Request was not processed. On 22 Feb I called back for same and got Ref (***). Got only Jan and Feb 2016. Called again on 25 Feb and asked for Ref (***), gave a deadline of 9am 26 Feb for request to be processed, I asked the call center agent to email the manager of the resolver but still nothing.<br> <br> I did receive several emails with links, but clicking the links leads me to a Session Expired page.<br> <br> Can it be so difficult to send a customer Invoices for 2015 ?