I can list a lot here but below are some of the top ones:
The top one being, since they pay you, they think you are their slave.
1. Top management is itself completely ridiculous. They will start messaging/calling you on WhatsApp in the middle of the night to do extra work, even if you have worked for the entire day.
2. Messaging and calls on weekends are very normal for this company and yes you won't get anything in return for putting in all the extra hours.
3. They literally abuse people and almost their managers fight frequently among themselves openly on a conference call.
4. Apart from salary no other benefit is provided.
5. The worst comes after you resign from the company. You will have to beg them to provide the necessary documents like termination letter and experience letter as well as salary of the last month.