Vodacom call centre heart ache

Having a terrable experiamce with vodacom.. call centre "representing vodacom" actioned a migration to an amount much higher that my normal debit order.. not what i agreed on.. vodacom takes more than a month to action the reversal which leads to another much higher debit order going off... very rude person from Vodacom calls to inform me that there is no way i am getting a refund, does not let me explain things, does not let me speak to a manager.. just tells me that they have decided, and that is how it is... vodacom call centre now tells me that the ticket was closed after the reversal, so no chance of a refund, no one can open the request again, and there is no one i can contact or dispute their decision with.. Vodacom cant help me..

Dont trust the call centres, and dont rely an Vodacom...