Can't buy race change

Hello,

for the last week I’ve been trying to purchase a race change, and have not been able to. Every time I’ve gone to the shop to get it, the loading screen to make the payment turns black and nothing else loads. I have follow the instructions in https://eu.battle.net/support/en/article/000135100 but they have not help at all. Today I went to heroes of the storm and try the shop there and it was the same thing with a loading icon in de middle. You guys changed the option to do many of the services outside of the game and thanks to that, I am unable to acquire them.

Can someone please help fixing this issue?