Hi Pablo,
The above problem mentioned by you was faced by myself too few months before, in my case what I did was I connected with azure support team over email and support center in azure and sorted out the issue related to my disabled subscription and they also helped me to enable the same by guiding me how to pay the previous due , you can go to subscription page in your azure portal click support center at the bottom and choose subscription and billing issues , it will navigate to required page for your issue and you can raise the ticket also for the same and the respective azure team will connect you for the issue resolution.
If you find the above answer is useful kindly upvote it and accept my answer too. if further help required feel free to connect me here.
Thanks & Regards,
Saravanan Ganesan.