There seems to be two different messaging systems on Provape's website. One of them never gets answered, the other one is typically answered very quickly (at least in my experience). I would recommend you use this form if you haven't already:
https://provape.zendesk.com/requests/new
If that link doesn't work, log in to your account on their site and then click on "Contact" at the top of the page. Then click on "Submit a New Request".
If you used the form on the traditional Contact Us / FAQ page, it does not create a ticket number, and - at least in my experience - never gets answered.