The WiX Toolset Discussions on GitHub is full of volunteers that work with the WiX Toolset. If you're looking for free support this is a great place to send questions.
StackOverflow is a great place to ask programming questions.
Tag your question with wix
to indicate that your
question is about the WiX toolset and someone might answer.
Questions sent to StackOverflow are also answered by
volunteers so remember to be respectful of their time.