What is the process and requirements for a 30-day extension on a visa exemption at Jomtien immigration?

Hello,

I'm wondering if anyone has completed a 30 day extension on a visa exemption at the Jomtien immigration office recently? It's the first time I have needed to apply for the extension and am looking for any experience from others.

I went there earlier today, but they told me to come back when closer to the expiry of the exemption. There was already a huge lineup for the 90 day reporting. I've already got the all the documents photocopied and the photographs

I did receive a TM 30 form from the immigration worker which I'm not sure about. I'm staying at a guest house which I'm assuming has completed the TM 30, but do I need to have a completed TM 30 to handover to the immigration with my other documents for a 30 day extension or will a receipt for a TM 30 lodgment from the manager suffice?

Thanks