Here's the solution that worked for me as the problem I had stemmed from having had a higher level plan (Advanced) then downgrading to Essentials. Upgrade to Quickbooks Plus (this will charge you a pro-rated cost but you can quickly reverse that). Then turn off Price Rules by going to Settings > Accounts and Settings > select the Sales tab > Edit the Prices and services section > Turn off price rules Beta. Then immediately downgrade your plan back to your required level of Quickbooks. This should credit you the pro-rated amount charged during upgrade.