How to increases the traffic ( call) and responses through toll free number?

Answer 1

I'm not very sure what you meant.
but to get traffic (more people to call)

one of the best ways is to get a number that is linked to a word.

1800-Dial-a-cab for example.

more people will remember it

the other way is basically just advertise through the newspapers and online magazines (flyers seldom work for numbers)

if you are adventurous and have a budget to spare, try speicality magazines.

hope this helps!