SAP UI Developer interview questions

I applied online and received interview schedule mail. Completed 3 rounds of interview and didn't receive any response. After following up for two months got the reply as rejected. Though in the third round interviewer gave positive feedback I got rejected.

Total 3 rounds. Round 1 : Technical - Questions on JS , html , css , some array and string questions . Round 2 : Technical - Architect took the interview . More advanced questions on promises , API calls and performance . Round 3 : Techno Managerial - Gave two problems and to solve them using best optimised way of time and space complexity . After three rounds HR didn't even informed about the result . Inspite of mailing multiple times no response . Atleast they should have sent the rejection mail or replied . Overall : Negative response for the process and HR.