Reopen VAT Period in Quickbooks.

I appreciate you reaching out, @Metropolitan-Consulting.
 

In QuickBooks Online, reopening a VAT report after it has been submitted can be challenging since doing so may increase the risk of errors. For this reason, I strongly recommend contacting our Live Support team for personalized assistance.
 

Ensure to provide the following information ready when reaching out:
 

1. Your QuickBooks Online Company ID.
2. The VAT filing period you wish to unfile.
3. A brief explanation of why you need to unfile your VAT.
    

Once the Live Support team successfully unfiles the VAT report, they will notify you.
 

Here's how to contact our Live Experts:
 

1. Click the Help (?) icon in QuickBooks Online.
2. Scroll down and select the Contact Us button.
3. Follow the prompts to request a callback or start a live chat with one of our experts.
    

For their availability, please refer to this guide: How and when can I contact QuickBooks Online Support. Then, scroll down to the Support hours section.
 

For further concerns, you can always drop by and post them here in this thread.