Poor customer service with no real answers

I have had 2 issues with Vodacom and keep getting shoved from pillar to post. I've done my part and phoned the correct departments and have references.

I got a second device through vodacom and sent in a change of cover form to take insurance off my existing device and insure the new one.

I then called in a few times in the month of may to ensure I won't be double debited. I get my June bill and I've been double debited for may and June.

Second query, elite mobile called me on behalf of Vodacom to do a migration on my one number and promised as they were converting my sms's to data I won't be charged more. On my June bill it's around 200 more.

I've logged all the queries and keep getting told they are waiting for feedback.

My bill is double this month and my debit is due to go off month of end.

No one can guarantee it will be rectified by then. I keep getting referred to billings who then divert me back to customer care.

I've reached the end of my tether and cannot afford a double amount going off my account.

I'm crying out for assistance.