GSTR7 QUERY

I have filed GSTR 7 for one of my client for the period Jan 2020. I have received an ARN also for that though mail. However now the same is showing as not filed and because of which my client has been charged with the penalty of Rs 10,000 in total. Now without paying that penalty, further returns could not be filed. Not able to raise ticket on GST redressal portal also since portal is giving an error of "Invalid File" when im attaching screenshot in JPG format only. Can anyone please assist.