Tech Mahindra interview questions

first round was basic aptitude and english comprehension second round had 2 basic programming questions third round was communication assessment fourth round was technical - basic oops and CS fundamentals is enough last round was hr

I completed 2 rounds of interview and got selected but this company will not respond properly to the mails or calls and won’t give any update. Finally they are saying the job is on hold. It’s unethical totally.