Inability of MTN to send Invoices!

I was on a MTN Topup 350 contract which expired in OCT 2015. I never received my AUG, SEP or OCT Invoices from them as I usually would every month! My ****tract then came to an end and my number was changed to prepaid. I've spent from the 15th of OCT until now trying to retrieve those Invoices which I so desperately need for work purposes! I've been in to 3 different MTN stores and phoned customer care countless times with no luck. I keep getting told that because I'm no longer a contract customer they can't send me my invoices. <br> <br> I've been extremely patient in trying to get this resolved and MTN have been less than helpful. I really hope that there is someone capable at MTN that is able to assist me! <br> <br> Regards<br> Mark Malherbe