Vodacom *****s via debit order

During October 2018, I cancelled my 3G account and ported my cellphone number to another service provider but Vodacom still collects premiums from me monthly for the full amount owed for both accounts, although both contracts were at the end of their term when they were cancelled. When I try and phone the call center I get caught in the endless loop of press this for this or transferred from one wrong call center agent to the next wrong call center agent or I just get cut off. In the meantime I am now R 710 per month x 2 months into the gutter with call costs and still no resolution. And then Vodacom still asks why I have moved to another service provider.