Because they said that you've "failed" their test, you're being spared an annoying rat race experience on a site that's down quite often. I know because I gave it a try (yes, having passed their test) for about one week, then I quit. So just walk on. There are other companies working with subtitle translators, and they are good.
I'd like to know which companies are those, please. I'm looking to re-enter the subtitling business and I would love to get into a good company. I think the experience I accrued while working on it should allow me to pass most tests and start working again. My first subtitling job actually came to me, I didn't look for it, so I'm actually not that skilled in looking for jobs.
Would you kindly point me in the right direction, please?