Armin,
Email Based Support is available in Priority Support licenses with a turnaround time of 24 hours. Please contact sales[at]canvasjs[dot]com for any sales related queries.
For forums based support, you can upload sample project to Google-Drive or Onedrive and share it with us so that we can look into code, understand the scenario better and help you resolve the issue you are facing.
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Vishwas R
Team CanvasJS