I can understand your frustration, but to be honest they were good to take the time to reply. Many companies dont give that feedback.

Use any and all feedback to get a clear picture of what you need to be successful..

Is there anything you can do in spare time to improve these areas?

Can you go back and study? Degrees and certs open a lot of doors...

Sit down and decide on what the job is that you want. Then evaluate:

• what skills you have that are relevant.
• what skills you don't have.
• how can you gain experience

Think outside the box. You could offer to work for free for a month to get your foot in the door and then impress with enthusiasm and a strong work ethic