Vodacom incorrectly charged my account and Customer Care not helpful!

I have been a Vodacom customer for many years. Currently have 3 contracts. One of the consultants phoned me to do an upgrade on one of the numbers, was not happy with the device and sent it back within the 7 days period. I never checked and about 3 months later realised that Vodacom has been charging me for the old AND the new device on that number. (August charged for old and new device which has been sent back, September charged for old and new device which has been sent back, October charged for the new device which has been sent back) I have phoned "Customer Care" and they said I will be refunded. The following month my debit went off again without a refund, I phoned AGAIN and they said they will refund me in November but no one can give me the refund amount. On 27 November, a debit went off my account of R4040!!! So instead of refunding me, they charge me? So I phoned "Customer Care" again, after being transferred a few times because no one can assist me, I spoke to a guy who said that I am being charged cash for one of the devices, which I did not agree to?! He then told me that he will make a note on the system for my refund, and I can phone again in one week if I did not get any refund. So I have to wait a week and none of my other debit orders will go off because Vodacom took all my money - the answer I got from the operator - "EISH"...…!!! I have asked to speak to a manager and she was also not very helpful, telling me that I have to wait... I asked for an itemised billing, she said they will send it within 10min.. I am still waiting one week later - NO Statement and NO refund?!

Can someone please get back to me as I cannot phone the so-called Customer Care line as they do not really care and seems like no one knows what is going on anyways.

Thank you