All help with ChannelUnity will be provided by ChannelUnity themselves.

Telephone support and a demo are available from ChannelUnity whilst you re in the process of first getting setup with Channel Unity.

After you re set up and running, their primary support method is by email. They also offer other support options such as live chat and phone. Please contact them for details. Their website is https://www.channelunity.com/

There is also a knowledgebase / FAQ at http://help.channelunity.com/