Default required field is not empty

Hi there,

I have created a custom drop-down list in the chekout form. I would like people to select a custom value. However, the plugin consider the first choice as a default value. the problem is people just does not take time to fill the form and let the default (false) value. They have to select their commercial. I have created something like “Select your commercial” but same, people does not take time fill and even if is a required field, we need this info.
thank you in advance for your help.