We're sorry that your client has not responded to the reminders about their overdue invoice.
We have now sent out a message letting them know that a formal "Letter before Action" notice has been issued to their business. Unfortunately, you need to discuss the matter with your lawyer now as legal action will be required to recover the lost funds.
Or, you can take action through the Small Claims Court as your client is not responding to the standard terms of payment.
Some useful resources that might help you: