messed up vodacom

I have 5 devices on contract with vodacom but it seems with every upgrade my accounts get messed up more and more. 1) I stopped getting my invoices (i need it for tax purposes) 2) 2 devices are now combined on one invoice instead of separate 3) one of the devices is a phone that my daughter use (and she is out of country) ,but it is set as the main device. When trying to get my invoice online from vodacom, it states that i am not the main account holder! ***!! - this has gone on for many years and phoning customer care just does not help