Incorrect change of details.

On the 12th June, I called to change my Address with Vodacom ONLY. On the 18th June, a debit order goes of on my account unexpectedly. I contact Vodacom only for them to tell me that I contacted them on the 12th and changed it, not once in that conversation did I mention a change in my debit order date, they say that in the next 3 - 4 working days I will be contacted as they have escalated my query for a refund. I then ask for a Ref No, and I was advised that it will immediately be SMS'd to me after the phone call... However nothing.

I have NEVER experience such weird service from Vodacom and I have been a customer since 2014 - What is going on