Help - just been sent an SD1 form over a disputed invoice

[Amazonmulu]

Super long story short a design firm commissioned a fabricator to make something. They didn't deliver 90% of it but still sent an invoice for 120% of the purchase order. We disputed it with 18 pages of evidence. Now they have sent an SD1 asking for the 120% of the purchase order but the form has no court details or solicitor details or even a reference number. How do I fight this?!

I can prove that they didn't deliver what was paid for. Plus we've already paid 30% as a deposit.

Should add it's a limited company and there are two directors. Only one letter served (addressed to the company) three days ago, but dated a month ago.

The fabricator has also threatened to come to our premises.

Any help or advice very welcome. I'm really freaking out.

Section 3 of the SD1 tells you what to do. You may also need to stop them from applying to wind up the company - see Dealing with your limited company's debts: Responding to a statutory demand - GOV.UK (www.gov.uk)

Thank you. There is no debt though 🙈🤦🏻‍♀️ We formally disputed their invoice on the ground that they didn't deliver anything (and we can prove it).

I understand that but it doesn't affect the process. Hope you get it sorted.