That can be a frustrating experience! I would keep trying chat, or if you have social media (Twitter/Facebook), try messaging them through there as well.
Link for other ways to contact support: https://www.visible.com/help/connect/
Also do you care to elaborate on the exact issue you are having, others on the forum may have experienced the same thing and can offer other solutions if the problem is clearly stated.
If a post has solved your problem, please mark it as an acceptable solution, it helps others that may have experienced a similar issue get a quick resolution.
