Why does the the Airtime and data sharing just not work!?

I'm having problems with the the airtime sharing, both with your ussd code and on your app. Iv been trying to create a new pin. It just doesn't work: on your app it says it can't create it and with your ussd code with says "Oops, can't process request. Please try again". And when I try to use the default code it says I need to create a new one. And iv been blocked for trying to do so. This shouldn't be something I'm having issues with, it's a one and done task