There is no ‘official service contact’ but issues and incidents can be reported on the #ops channel on slack which is monitored by people from The Things Industries.
Neither is the forum an official support channel but other users will usually try to provide assistance.
On ‘The Things Network Status Page’ you can see an overview of the status of The Things Network services and any possible known issues (this page is better updated lately).
See the following topic for more information: The Things Network Status Page [HowTo]