a) I want at the end of each survey the user-customer to fill a form with his name, address, phone etc.
No problem with this. You can use a custom form component or iJoomla Surveys component in order to make a form with custom fields. On backend you can set a redirection page to that custom form (if you use another extension) or in the last survey´s page you can place your custom form (if you use iJoomla Surveys).
Then i want to be able to see the answers of each customer seperate from the backend.
At this point you can export general statistics to a csv file, meaning that you will only be able to see global data instead of answers by customers.
Anyway, on backend you can consult answers by customer.
If this is not possible with ijoomla survey how i could do it without be necessary for the users to register in my site?
You can set your survey for all visitors.
b) The email with the results how it looks like? I cant find it in any demo page.
This email looks like this:
New survey!
Survey name: YOUR SURVEY NAME
Results:
QUESTION 1: ANSWER X
QUESTION 2: ANSWER X
QUESTION 3: ANSWER X
Remember that you can customize this email.
Best regards,
Author