Unauthorized debit in the middle of no where!!!

I received an unauthorized debit from my bank account on the 21/09/2020 for an amount of R242. I dont have any account with vodacom nor use their network. I am now trying to get hold their customer care, to no luck yet. I dont have any information not email not sms to show that i was in contact with any of salesguys. I have now reversed this debit with bank, but i am advised it might find its way back. I am charged for this reversal. Can Vodacom explain this.