Poor Customer Service

Tried to make an online purchase on 31 May 2020 and used a gift voucher. At checkout I opted to pay the balance via my account. I entered the OTP and the payment did not go through being (R19.45) then I tried two more times and it did not go through. When I received my statement three payments reflect being : R19.45, R249.95 and R249.95 totalling R519.35. No order has been generated for this but I am expected to pay this.

I raised this with the call centre on 11 June 2020 and was told it will take up to 48 hours to reverse but it did not happen. I called twice on 13 June 2020 but to only be put on hold and my call being cut. I called again on 15 June 2020 and the agent advised this will be reversed in 7 days. 7 days has passed and no response or credit given. I am at a loss for my gift voucher and expected to pay these amounts and service fees and possible interest and also ruin my credit record if I dont make payment. Can some one please get this reversed !!