Year 2021: accidentally filed unsecured loan for 2020

Hi experts, 

 

I had bought my first property last year (2020), and I just realized that I made a mistake of saying the loan was not secure but when in fact it was. So I missed out on a good amount of refund. 

 

Is there a way to reclaim that amount, or that money is long gone? 

 

Thanks in advance.