Horrible service

This morning I went on my app to purchase electricity. I put in my meter number and checked it twice before proceeding with the transaction. When I received the token and tried to use it and it wouldn't work. I went back to check and it had taken my old meter number. I have now purchased 500 rand electricity for a meter that I cannot use and I really need that money. I tried to phone FNB and they cut me off. I have never actually gotten to speak to anyone. I have seen that many people have had this same problem. I need to speak with someone