Error when trying to use airtime to purchase bundle

[AirWolf]

Get the above when I try to use airtime to purchase a once off 5GB data bundle.
I have enough airtime.
Contract uChoose flexi R200.

Purchased last month without any problem.

 

[AirWolf]

Tried both on the app and on the website - same problem.

What does that error even mean? :wtf:

 

[AirWolf]

Still unable to purchase a bundle .