Unauthorised Debit Order on account that is UP TO DATE

I have paid my Vodacom account via EFT monthly, since inception of the contract. Now because of LOCKDOWN, Vodacom decided that they will take it upon themselves to load a debit order on my account. I reversed this debit order, as I had ALREADY paid my account on the 25th as I always do. Now I get a sms saying my debit order bounced and to call the number on the SMS. SHOCKER the number is not working due to LOCKDOWN. I WILL NOT pay a fee for this debit order, as it was NEVER AUTHORISED BY ME. I CANT WAIT FOR THIS CONTRACT TO RUN OUT SO I CAN CANCEL IT!!!!!!!!!!!!!!!