Very unprofessional company. I had given 2 rounds ...

Very unprofessional company. I had given 2 rounds of technical interviews and cleared them both and the HR then asked me for my docs required for verification. I had to chase them for a month to get the feedback on my verification and after a month, an email was dropped to me saying we have found another candidate with matching skills. Wasted a whole month of my time and after selecting me, they suddenly email me of rejection.