What does this mean?

“Regrettably the Help and Quality Teams are unable to
offer a critique or feedback on your rejected submission.”

I don’t
think that is a serious response to a rejection.

Every design
I upload is a serious work for me and I put all my effort to do so.

I am very
upset with this, because I do not know why my design was rejected.

What should
I do to avoid making the same mistakes?

“Regrettably the Help and Quality Teams are unable to
offer a critique or feedback on your rejected submission.”

Cricket sound here.