Poor Customer Service.

After MTN made changes to their billing process I firstly received accounts that were not for my number, after reporting that and getting it sorted out I have now stopped getting my invoices, itemised billing and my statements. The last time I received any documents was September. On the 7th of December I ask MTN via email to send me my documents for October and November, on the 8th I receive a reply asking me for information, I reply on the 9th with the information and today on the 11th I have still not received any documents. Why is everything with MTN such a struggle, how hard can it be to generate my documents and email them to me and then to make sure that I get my billing sent to me every month.