Register users through contact form

Hi!

I would like to know how could I create a user account using the contact form, so that when someone sended an issue through it, he/she would recieve an email with:

• The account confirmation link
• The ticket with the problem

So that I could assign the problem to that account, and let only THAT user check the status of it’s tickets. And also, if he/she already have an account (no matter if it is logged in or not) just send the ticket and not create the account.

Thank you in advanced.

The page I need help with: [log in to see the link]