Confused

I was in the market for a new dentist, and after researching, decided to try Suwanee Dental care. Impressive building, cool features, and my cleaning went well. There are a few things that are bothering me about them, though. First, I have had to have three visits, and have had no work done. My fillings would have been my fourth visit. Being a Mom with young kids, it has been a real pain for me to get childcare for all those visits. First visit was to get a tour of the office and have the doc look in my mouth. The next visit was to have a cleaning. The next visit was to have a consultation, and my fourth would have been to get work done. It's not the biggest deal in the world, but would be much more convenient if they could have combined my tour with my cleaning, or had the doc look in my mouth and then given me my consultation, instead of having me drive over there multiple times. Like I said, not the biggest deal in the world, but inconvenient. My other problem is that after each visit they require payment, even with insurance. Which means that they estimate what they THINK my insurance will pay and then REQUIRE me to pay the difference. Each time they overcharged me. I found no statement in their payment policy of this, so I was shocked to hear it's the case. They wouldn't let me leave until I had paid. Now I'm stuck not being able to get work done because I'm not able to spread my payments out. They're payment plan charges interest which, you know...