14 days ago, after a lot of trouble, I renew my realms in the Windows Store, with a subscription activation. in the game, the realms say for 14 days, that the realms has 0 day remain, but I was fine because it works and I paid the month. Today I open d the game and the game says that the realm was expired. The renew button shows again, but I paid for a month, not for 14 days.

FIX IT AND DON'T IGNORE US.

EDIT:  When expired I contact Mojang support, useless as usual, they didn't respond with an actual response, with a reason why all of this is happening, they just say in a nutshell "ask Microsoft for the paying stuff". I call Microsoft support for a refund for my subscription and they immediately gave me, then I paid again, for a new whole month; now, the setting page of my realm says "Renew every 30 days" in the Duration section. 

Try to ask for a refund and purchase again if you don't see "Renew every 30 days" in the Duration section.