PGWP refused due to no language proof

[Naturgrl]

Actually at the time of applying I did not attach my language test results, because it was kind of a DIY, and there was no separate section to attach it. However, I attach it through webform after I got a refusal

So you were rightly refused because you didn't submit the language test so no error in law. All you can do is wait to see if they reopen your file. If haven't heard or gotten update from webform after 30 days then call IRCC. Did you get acknowledgement that your webform was submitted?