Nah!
I have no chiropractic experience, but any social media campaign that requires you to fork out a large sum upfront sounds fishy.
They may be legit, but personally I wouldn't trust anyone to treat my spine and backache without any personal reference. I think you know deep down something is not right here.
Yeah I think my spidey senses were working overtime to get me out of that situation! But I did get an xray resulting in an awesome convo with the osteo and am feeling better going forward. It should be illegal. Honestly I just want to sit out front of the clinic and warn people going in.