Payment to the wrong Account

I did a payment to Account that I am no longer using and I called Agent by the name of Mfanafuthi or Fanafuthi with reference number ***0-i98 who said they can not assist me as he enquire to his manager Vennish if I heard him correctly, on the Capitec App paybills option there is no proof of payment so I had to do screen shot and the company failed me as they can not transfer the amount to the correct account, as the agent confirmed that they do see it on the correct account.....this is the worst service ever multichoice is just a **** how can they partner with Capitec bank without knowing that there's no option for proof of payment on the pay bill option? How can a huge company be so ******** 😒