What should I do if my application via uni-assist is rejected?

First work out who said no: uni-assist only checks formal criteria, while admission or rejection is decided by the university. What you can do depends on which it was.

#If uni-assist's evaluation is negative

• Status "Faulty" means your application does not meet all of the university's criteria, so uni-assist cannot forward it.
• You can upload missing documents in My assist before the university's application deadline; re-processing usually takes 4–6 weeks, so act early.
• Once the deadline has passed, the application cannot be forwarded this semester; you reapply for a later semester and pay the fees again.
• Fees are charged regardless of the result and are not refunded after a negative evaluation (75 € for the first course, 30 € for each additional course in the same semester).

#If you think the evaluation is wrong

Under uni-assist's terms, errors in the evaluation result must be reported to uni-assist by post or via the contact form on its website within 14 calendar days of receiving it.

#If the university rejected you

That is the university's decision, not uni-assist's. How and by when you can challenge it is stated in the university's decision letter — follow those instructions.

Source: uni-assist – Status & evaluation result · uni-assist – Terms and conditions