PowerBi Integration with Sharepoint List - Lost dashboard access

[GBHL]

Hi 

Total PowerBI newby here.  I had a free account which I used to create a PowerBI dashboard from a Lists via SharePoint.  I think I may have been upgraded/took up a free trial of Pro which has now expired and I have totally lost access to the dashboard via the sharepoint list.  Message tells me "You can't view this report without a Power BI license." followed by a pop up that says "Upgrade to Power BI Pro.  To use Power BI Pro features, upgrade to a Pro license. "   

Based on my limited research of the features available in the free version:  1) I thought that at the expiry of the Pro trial, my account would automatically rever to the free licence 2) that this free version is sufficient to use the integration to update the dashboard reports I have built.  Maybe this is not the case.  

I'm happy to upgrade to Pro if that is needed, but surely if it was just that I would still be able to access my report via my free account?  

Any advice gratefully received!

Many thanks