Invoice request not done after 5 months and repeated calls

I have 5 separate accounts with Vodacom. when I took out a new cell contract, they decided to combine this new account into one invoice with my main account. I have called every month since September 2017 and asked for these accounts to be separated. I do not want and never asked for a combined Invoice.

I receive SMS's stating that my query has been resolved only to find at the end of the month that it is not. I have also been told that if I have multiple accounts, they will be combined. This is nonsense as my other accounts are not combined.

Vodacom please sort this out once and for all