Xoxoday Senior Frontend Developer interview questions

There are 1 assignment and 4 technical rounds. One round for JavaScript, one for html and css another one for react js. Assit is react js interview. They told me that you are cleared all the rounds, need to discuss with manager to proceed offer. They make me wait for around 2 weeks. After that they told me that you rejected in that round this round. They are searching for a reason to reject me. It is the waste of time for me that I spent on this company interview process