And a general contractor would NEVER sign a customers contract 

If you haven’t already, make sure you’ve documented everything thoroughly—photos, messages, invoices—and highlight the guest’s negligence, like leaving windows and doors open in extreme weather.If you haven’t heard back after asking to escalate, follow up again and politely but firmly request that a senior claims specialist review the case.

As for submitting an LOI without proof of funds, sellers may still consider it if you present a well-researched offer, highlight your experienced team, and provide a clear financing plan.

This allows them to get more capital so they can make more loans without having to grow their asset base, while also maintaining their relationship with the customer through monthly payments.

I tried to work with Digb and they provided some of the worst customer service I ever experience.

Highlighting the strong profit potential and taking measures to address any concerns about costs, scope, or holding risks will make this an even stronger pitch.

You're running a business and businesses choose what payment methods are acceptable to them - not the customer. 

I'd lower the price slightly below your competition and get real reviews.Be customer focused.

It took new construction costs from $800-2500 down to $325 / SF and instead of 2 years it can be done in 8-12 months (design, permits, fabrication, shipping, and erection) depending on how much homeowners customized the standard plans. 

They now use "Dave" to handle customer inquiries efficiently and promptly.