Kisan Network Computer Vision Engineer interview questions

So applied through the online portal, in which I got an email, talking about the position and the vision of the company. And I was told they will be providing a hiring challenge which I need to solve within 48 hours. Once I set for a specific time. I submitted the complete challenge with solution and documentation within 24 hours and updated the HR. No reply. I mailed them again, and I get a reply after one week, stating still working on it. After a couple of days, I get an email, stating an error occurring in their execution. And was asked to remove the error. I did that ASAP. And mailed the HR, no reply. I got a reply again after a week, stating still working on it. This kind of behaviour is not expected from a firm.