BAD SERVICE - VODACOM - BAD SERVICE

I called Vodacom accounts department on ***, but after 9 times of TRYING, I end up at the call centre every time. I requested that my tax invoices for the period of 1/03/2014 - 28/02/2015 be sent to me via email, but only received an email after the 9th time of calling Vodacom and requesting the information, the only problem is that they only sent me tax invoices from Aug 2014 - Feb 2015. What about the other 5 months? <br> <br> It seems like the employees at Vodacom call centre and accounts department are just unwilling to assist or they don't understand what I need. Sometime I think that if you pay people little, expect little work.( SH?? SERVICE )