Domande di colloquio per .NET Core Developer presso Infosys

They have 2 technical interview both went well. I cleared both technical interviews without any difficulties. After clearing the tech rounds I received email to share required documents via email. After that they kept me waited almost for 1.5 months without sharing any clear status of my offer letter. I follow-up with HR team lots of time but they are not that responsive. After waiting for 1.5 month and without giving any clear status they sent me rejection email. I asked the reason for rejection but they are not sharing any details. Very upset with the process.