Urgent assistance!

So I accidentally made the incorrect payment, I called the call center, spoke to Tobogo and he advised me that I should speak to a supervisor for the reversal which they should be able to do. He then provided me Welton's contact number and Tarynn's contact number. I tried calling both the numbers but i'm unable to get through.

I really need the reversal to be done as I accidentally EFT's the incorrect amount and I cannot afford to pay that amount now, especially when i'm the only person left working in my household.

Could you urgently assist me as I need a partial refund urgently.