https://support.apple.com/en-gb/HT204084
Start here and then just selected an option until GCN was allowed to be a chosen app. It took a few attempts and I can’t remember which one it was. I think it was report a quality issue and you then get free text after selecting the app.
Everytime I try and select the refund option, the GCN subscription disappears from the list of options, nor can it find it by value. Must be developed by the same team who develop iTunes, it's so shit.
https://support.apple.com/en-gb/HT204084
Start here and then just selected an option until GCN was allowed to be a chosen app. It took a few attempts and I can’t remember which one it was. I think it was report a quality issue and you then get free text after selecting the app.