Nagarro Data Engineer interview questions

Received call from HR , asked to take aptitude test , got email saying have cleared the test , HR called back took all details and said will scheduled tech road , then no response when followed up after a week got response saying looking for panel will revert then no response after a month a different HR calls and asks to take test , i explain the situation and previous HR name , I was told will get call from previous HR but till now no one bothered to call .... total time waste and unprofessional behaviour