Still awaiting my itemizing billing but charges have been taken

A month ago I requested for my itemized billing to be activated, And I requested copies for March to may. I received my June bill with the itemized billing but have not received my March- may bill as yet. I have escalated this 3 times to the mtn device champions and to date have not received copies of my itemized billing yet they have billed me for these copies in my latest bill. The service champions have said that this is a separate department and all they can do is email this department. Such pathetic service , and really frustrating as mtn has taken my money but I am still waiting for my copies. No point in calling the 135 no for assistance when they are unable to assist with your query. I was told to log a complaint with head office. How ridiculous! My ref no was ***