AMD interview questions

Interviewers were cordial and respectful. Nothing seemed to have gone wrong and I answered 90% of the questions correctly. I generally dont form any expectations post interviews but for this one I was hopeful as I did not see anything that might have gone wrong during the long non stop group panel interview. They also introduced me to the team. I waited for a response for a week. As there was no response, I sent a follow up email to the HR who sent me interview invite and also to one of the interviewers. There has been no response from AMD after this. No feedback. No call. I did not expect this from a big company like AMD. Such kind of behaviour of HR leaves a bad taste forever. No point in sending another follow up to such teams who do not value your time and energy.