RWS Group Language Specialist interview questions

I was strung along by the recruiter for months with long periods of hearing nothing, then them reaching out to ask if I was still interested, then silence again. They eventually skipped the interview altogether and sent me an (unpaid) test. The feedback I received introduced some errors and marked valid corrections as mistakes. This came along with a somewhat rudely-worded rejection. After so much wasted time I didn't even try to ask for clarification. As far as I can see, the position has still not been filled.

The interview was easy, and the talent manager was kind. However, after passing the first interview, they asked me to complete a test, which I did. When I received the results, I noticed that their corrections were full of errors. I asked for clarification and provided evidence that they had actually introduced mistakes, but they simply replied, 'Well, this is our decision.'