Vodacom Debit order not stopped

I have been living overseas for 7 months now. I have tried to contact Vodacom via email, via Facebook and via their fb messenger app also. Somebody responded to me and took all my details and assured me that the account would be closed. I continued paying from April even though the phone is useless where I live now, because that was the contract I signed. But now Vodacom has yet again debited my account and the account is supposedly closed. When the person who I dealt with, asked for my phone number to call me to get details for closing the account, I gave it to him/her and then they said they couldn’t call because it’s an overseas number. Well no kidding mate... that’s what I’ve been trying to tell you all along. I DINT LIVE IN SOUTH AFRICA AND I WANT THE ACCOUNT CLOSED AND THE DEBIT ORDER STOPPED. Vodacom ever remains, the debit order ******* it seems...