ITC REFUND APPLICATION IN GST FOR EXPORT WITHOUT PAYING TAX

Hi Sir/Madam,

I have a small doubt with ITC refund application.Actually the case is we have filed gstr 1 as nill rated supplies instead of exports table where as the entity is doing expost business without paying tax.This was filed in 2018-19 and returns for all the months were filed accordingly. How can i correct this mistake ?

Please help me in solving this issue.

Thanks,

Akhil.P