Wesbank incompetence

About two weeks ago, I settled my account with Wesbank. An amount of roughly R3200 was overpaid and I requested a refund. Furthermore, I received an email to confirm banking details where the refund needs to be processed to. I rep**** with a banking details and followed up about five days later, as the money did not reflect my account, only to find out that Wesbank refunded it l to the incorrect account number after being instructed what account number should have been used. It has now been almost a week that I have been waiting for them to request a refund and to also refund it to the correct account. My question is if my account was in arrears, I would’ve been charged interest, so it should only be fair for the amount of time that I waited I should also be getting interest on the money. I have sent an email to follow up but I have had no response yet. I am currently in china and I can only be contacted on my Chinese telephone number. I have been communicating with him over email for the last two days I have had no response. ***. Do not contact me on the South African telephone number.