Design and coding questions, was asked 2 DSA mediums and current project work,1st round was with senior second round with Hiring Manager. Questions are leetcode style nothing different. Process was smooth

The interview had 4 rounds. 3 technical and 1 managerial round. After clearing 4 rounds, the HR had one more candidate in the pipeline so he kept giving me weird reasons for not rolling out an offer. On the day he was supposed to roll out an offer, he told me some lies telling that process is suddenly slow and he couldn't get approval. Later he suddenly said he cant raise an offer as the position suddenly is on hold. Few months later i see, the position is still open on their career website and Linkedin. So, basically they just line up candidates for interview and after clearing the rounds with difficulty , the HR plays inky pinky and picks one and ghosts others. I felt cheated. And request others to be aware about this.