maybe it doesn´t allow to activate the day as you already used all of your Inbound/Outbound days and you are transiting through your Homecountry written on the pass :)

There are possibilities to modify the activation or deactivation of the in-/outbound?, in the App it appears active but does not allow me to change them 

If they are already used by the app it´s not possible to get them back only future trips can be canceled (deactivated) for past days and current date there is not  such option.

That means I've lost all my remaining trips?

Someone has a contact number where I can really contact them, because the email is not answer yet and the number I found is out of service 

Hi Alejandro, one of our Customer Support agent replied to the message you sent them just now. If you have any further questions, do not hesitate to reply to her message so that she can assist you further. Have a great evening!