[mothered]

@mothered: any ideas you can give to me?

As @relaxed state mentioned above, send them a corrupted file using the said website.

I've tested that site and It works very well Indeed. I can confidently say (due to corruption), that they'll request the file again. Do just that, but In a different file format - just to give the Impression that you're making an effort of your part to resolve the Issue. If need be, repeat the process with the corrupted file using various file extensions, and assure them the file Is working fine on your end. At the same time, be polite and apologetic.

In my experience, the majority of times, It's resulted In a successful outcome. They simply end up giving In hence fulfill your request.

I'll update on my results.

When It's time to do so, please do.