As a client, you have full authority over the invoices that your contractors send. You can also disable the invoices entirely, omitting you as an option to issue an invoice on the contractor's side.
Go to your profile page and locate the "Receive Invoices from Contractors" option below your card. You can turn this option off and stop receiving invoices from your contractors.
If you have any additional questions, please don't hesitate to contact our support team. We're always here to help!