Hello Rafa Lachica Garrido,
Thanks for your question
Developer support plans entail Business hours access to Support Engineers via prioritized responses on Microsoft Q&A with sev C. This is documented here:
https://azure.microsoft.com/en-us/support/plans/
To my knowledge if you request assistance here on of the Microsoft staff will respond to you within SLA period or another volunteer like me.
However billing tickets are still free and can be created via the portal