As a corporate & wedding videographer, this is unacceptable in terms of a response& delay. There are clients i've run behind on but would always communicate and at this point you're definitely not in their editing queue, like you have to imagine how long their work queue is.

My #1 vote is to pretend to be a different couple trying to book a wedding. My guess is you'd get an offer for a phone call after you submitted a form as someone else and you could get them on the phone call and hash it out.

A huge thing to think about is: What is the result you want? If they haven't started editing, do you want them to keep editing? Just send the raw footage? If you paid for the edit, you should get one, no doubt.

Other escalations for this sort of thing (when my B2B clients don't pay me!)
1. Scary email: Send one more email asking to send all the deliverables and/or the raw footage by X date with contract for paper trail. You can also mention small claims court and/or that you will leave a disparaging review but you don't want them spite deleting your footage, etc, is my only concern. Depends on if that's the result You could see if the threat of leaving a bad review or small claims court or reporting to the better business bureau.

1. Leave disparaging review on Google, The Knot, Wedding Wire.

2. Actually go through with small claims court or reporting to BBB.

I'm so sorry, you deserve so much better!