Work permit - Residance Permit - Taxes

Hi,  I studied and worked in Denmark 2012 and I still get tax refund. Do you know how it is possible? Besides that, do u know can I have any chance for apply to residence permit? Has anyone ever seen like this situation?

It seems very strange. Are you sure that it is tax refund? I cannot believe that as 2012 is closed long ago.

https://www.nyidanmark.dk/en-GB

/Nellie