Tenjin Sales Development Representative (SDR) interview questions

Submit my cv on mid August, then arrange 5 rounds interview on the next 2.5 months. After that, no feedback, I sent 3 emails to follow up. Almost one month later, they suddenly reply and asked me to do 3 assignments. I did and then no further feedback until now. They JUST let me wait. Almost 4 months passed, what can i say？SUCH incredible ridiculous terrible experience I NEVER HAD.