Apple Mechanical Engineer interview questions

There were supposed to be two technical interviews. My first two technical interviews went really well, and I was supposed to hear back if I had gotten the job or not. 2-3 weeks later I find out that I had a third technical interview. It took me a while to hear back so I messaged my HR contact to find out what the status of my application was. She told me they were not moving forward with my application. About a month later, I get an email from my HR contact saying they might have a position available for me. I let her know that I needed to know ASAP so I can rearrange my plans if necessary. I emailed them every week for about a month asking them to let me know if they had a position open or not. They told me the day after the deadline I gave them that I did not get the job. They strung me along for 4 months.