Extremely poor client service and communication

I recently bought a voucher from my African Bank account via internet banking. By mistake i selected my old cell no. However when purchasing a voucher its required to approve the transaction but never received the pop up for approval. A screen then came up saying that the purchase was not successful. I tried again using correct cell no with same result however received the code via sms. I found it odd since the transaction did not go through. When i checked my statement i realised both voucher purchases did in fact go through as the money is out my account. The voucher that i received via sms worked and that is not the issue. The voucher where i entered incorrect cell is now hanging somewhere. I went to purchase history but its only displaying last 4 digits and i can only resend it to the no selected. Now i have logged a query and the help im getting is less then usefull. They just telling me what i already know!!! So why cant they just give me the vouvher no? Or resend it to correct cell no? I mean other banks you are able to see voucher no on the app telling me African banks system is outdated or just not user friendly. NOW PLEASE AFRICAN BANK RECTIFY THIS OR REFUND MY MONEY. Human error occurs and you should have something in place to assist your clients in such cases. Just to add i spoke to a Caroline on your whatsapp chat portal and boy was she helpfull( SARCASTIC). I really think this is by far the worst bank when it comes to client satisfaction!!!!!!!!!!!. So im WAITING for assistance ASAP!!!!!