I have used support many times and generally had very prompt responses. There are delays when they appear to be busy - such as the appearance of a new version - must be getting a vast number of tickets
When I have a matter that is very delayed I use live chat just to ask whether it could be dealt with soon and every time I have had the problem resolved satisfactorily. I would only do this if it was crucial to do so - I understand that this could just cause further overload.
I recognise that they have a business just like me - turning on more qualified period for a peak demand is just not feasible and keeping extra staff "just in case" if crazy.
So I have learned to work with Viart and not demand anything unreasonable. And, like vic140, the answers almost always resolve my issue on first response.
Chris