Wrongful debit order

I cancelled my Telkom cellphone contract in May 2020 (acc number: ***). I contacted them to request the settlement amount to finish the contract and they gave the amount of R3394, which I paid into their bank account using my account number as reference (Absa Bank : *** ? Branch Code : 632005 ? Reference Number:EFT REF number on Telkom billing invoice? for the number ***-Case ***5) on 25 May 2020.

On 17 June 2020, Telkom debted my bank account with another R2156, 74. I contacted their call center that entire day struggling to get through. Eventually I spoke to an agent who indicated that the amount was debited from my account, because I used the wrong reference number. However she will send the query to their contract department who should solve the query and pay back the funds due to me. She indicated funds due to me should be paid back between 3 - 7 working days.

On 26 June 2020 it was the 7th working day and I went into a Telkom branch explaining my problem, however I did not receive any assistance. The shop assistant just provided me with a email address,which I feel is redundant as I have already spoken to one of their agents.

Assistance with this matter will be highly appreciated.

Regards