When I graduated 2 years ago I sent my resumes through HFO, but got no respons either until one day a employer emailed me that they were interested in me but please send the resume as my resume wasnot attached to the email. Can you imagine, I have been sending job applications without a resume, if you are the employers and getting thousands of applications every day, would you bother to ask me to attach my resume? I just don't know how it happened but it happens. After I sent my resume via my own email and interviews came in and got offers. Think of every step, is there anything goes wrong? like leave the wrong number? resume can't be opened by the employer?
Good luck with your job searching! I believe you will find a job soon as nusres are still short around. Don't forget to share your experice after you get a job