Hi @DanielBarbour and welcome
There are a number of ways to contact 
outside the app which are outlined in [this topic] which you might like to read through.
To be honest, you might find a better and more speedy outcome by just complying with the request. This is a user forum and members here can only speculate as to the reasons which might not be at all helpful and delay matters further for you.
As to why your account has been selected for a contrôle is academic but since it has, you need to comply. What triggered it is unlikely to be discussed with you.
I hope you get the matter resolved speedily and in a timely fashion for your travel needs.