Tech Mahindra ABAP SAP interview questions

There was 3 rounds for the interview Technical phone in interview Technical and HR phone in interview Aptitude test Then i cleared the round and got an email for verification of certificates, after i attached and send my certificate to the company there was no reply, still i am waiting for 3 weeks for the results

It was a walk in interview and i went there by 11 AM but i was waited there till 3 PM to get my turn and they asked around 15 min and they decided that i am not through. I felt very bad that i had waited so long instead they could have scheduled the interview with time slots.