Moody's interview questions

I was intervied for frontend developer role. I had 2 interviews. 1st one with HR, I was asked some questions, answers for them could be found in my CV. 2nd one was technical one. During this interview I found out they are actully looking for backend developer. The asked me some technical questions, mostly they were about SQL. And they told me I have to complete unpaid test task that will take around 8 hours and the expect me to send it back to them in 24 hours. I refused,