TMentors Full Stack Developer interview questions

I have applied on wuzzuf and got a phone from the project manager asking about my experience and has sent me task after the call. The task was supposed to take 20 hours and needs to be summited in 24 hours. I have done the task and didin't get any feedback. I have sent a follow up mail and got no reply. He has called me after a month sending me an offer and then they have disappeared again.