Double Billing

I informed Vodacom am closing my bank account and to debt me on my new account and they debited me on both accounts. I logged the complaint on *** last week Monday and they informed me the will contact me in 2 days. The hadn't contacted me and last week Wednesday I called again and was told that the call center agent hadn't logged this and they logged this issue. I called again on Saturday and was again told that my issue wasn't logged and this time I must send them a proof of the double debt which I did. Today I was called by another call center agent who told me they couldn't see this double debit and they haven't received the proof of payment. I immediately went to the bank to get a transaction history from the two accounts and went to a Vodacom outlet for them to send it through. NB Am due for an upgrade and will not continue with Vodacom's contract services.