We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
We have an update rolling out now which includes a fix for this. There is a different issue where office companies may not disappear as they should, which can lead to the bugged ones getting stuck in your city. Please see the workaround at the bottom of the patch notes if you're still having issues after updating to 1.1.6f1.