Wrongfully triple debited

I have a Telkom data contract. May month end, Telkom debited my account 99ZAR as per agreement. Unfortunately the account didn’t have the funds, as such the payment bounced. I then made an EFT with my other account immediately. Instead of Telkom then realizing this, they want to triple Debit my account month end June. Their system doesn’t recognize the EFT payment I made. Getting assistance via the phone has proven, the 081 180 voice automated options don’t really help. I need to talk to someone, but Telkom isn’t forth coming with those communication platforms. I am so disappointed.