Open Wide Dental

As a preface in the past I've been happy with Open Wide Dental, and have been going here for almost 4 years now off and on, but a series of circumstances have left an extremely bitter taste in my mouth.
To begin back towards the beginning of the month I called them because I was having issues with one of my teeth and wanted a call back to see about any financing or if they could help me out in any way since I'm low income like they have in the past. No response after close to a week, this should have been my first sign, but I called again, they left a voice mail soon after with no real answer to my question, it was basically "We'll see, maybe, after you see us". Not really the kind of response I wanted since my concern was finances, what if I went in and they couldn't work with me now?
Anyway I took the chance (once again it is my fault for ignoring the signs) and called them back, made an appointment for a couple of weeks. The night before my appointment I became ill which was keeping me awake as well, so I had no choice but to cancel my appointment. To be fair it was past the normal 24 hr window (I left the message around 12 am because I knew there was no way I was going to feel good enough to go) cancellation I've ever made with them. I called them that morning to make sure they got my message, they did, and that was that. A week later I get a $50 "no show" bill sent to me. Which they have every right to do, but doesn't make it good business when you have a loyal customer who always shows up to their appointments, AND referred MULTIPLE people to their location.
I was, of course, upset and did call and leave a message expressing my disappointment and that I was a bit angry about it, but it was a civil message, even if I was clear that I would not pay the $50, that I felt it was a slap in the face, and because of our financial situation I would have no choice but to go somewhere else if it wasn't resolved. That was over a month ago and no response. So much for caring about your customers. If they are willing to lose me as a customer, and maybe future referrals, that is their prerogative but it seems like a bad move to do this over $50. But it seems consistent with my treatment I received with a lack of response prior to the $50 no show (which I didn't even know they had).
Have to give them credit though, they did get my bill of $50 to me faster then any responses to my phone inquiries!
They even managed to send me another bill since I called a month ago.