Visa Inc. Sr. Software Engineer interview questions

I got the call through a consultancy, it started with a hackerrank test, which they had shared with me couple of days before the face to face round. There were total 5 rounds which I attended among which the last one was managerial round. They had asked me various questions on MVC, WCF and WEB API . Overall interview experience was good and HR kept on telling me that there is a positive feedback from their side. She asked me to be ready with payslips and other documents. Then next week there was no response from their end. I kept on calling them like a fool, but didn't get any response from HR. Finally when she picked my call, she said she will let me know soon. Same story continued for another 2 weeks until I heard the final feedback from HR that they wouldn't be proceeding with my candidature (after 3 weeks ). This is something really unprofessional and never expected from a company like Visa. Sincere suggestion is don't waste your valuable time by attending interview with Visa. They don't have even basic courtesy to inform the candidate about the feedback by email or phone even after a candidate spends 4+ hours interviewing.