Vodacom fiber salesman ****s

A Vodacom agent came to my door offering Fiber packages and said that they will send me details regarding these packages if i want to migrate over to vodacom. However, without my permission they have gone and debited an amount for no reason without any confirmation or consultation and I have no contract proof either. I have had no communication from any consultant or any email notification about this debit order. When I went to the vodacom store they tell me I need to call the number for Fiber as they do not deal with this and they are closed at 1pm. How it is so simple for them to take my money but now I have to struggle to figure out how to reverse all of this?