Sent a report to add English covers, Japanese covers were overwritten instead

[DokterKaj]

I was prompted to post about report-related questions in this subforum by this reply.

I sent a report to the manga Coffee Moon yesterday asking to add some official English cover arts for Volumes 1–3. This report was accepted, but when I checked the page, it seems like whoever accepted my report accidentally overwrote the Japanese covers with the images I sent, instead of adding them under the English locale.
I sent a follow-up report informing staff of the issue, but this report was refused. I'm assuming it's because I didn't link any Japanese cover arts to reupload. The thing is, the Japanese cover arts that are still on the site (Volumes 4–5) are super high resolution (1804x2560 to be exact) and I don't know how to get cover arts to replace Volumes 1–3 that are such high resolution. I sent the report assuming staff could roll back the changes to before the cover arts were overwritten.
What can I do in this case?

 

[BraveDude8]

I grabbed the covers from Bookwalker using this tutorial and reuploaded them.