Davinci Virtual Double-billing, over-billing, usury practices Internet

These guys sell virtual office services whereby you can work out of your house but have a Manhattan address and telephone exchange. When I signed up, I was told that I would have unlimited access to the 212 phone number they assigned me, then I got a bill for "additional usage." This was a month into service. After launching my new website and printing the 212 phone number I was renting from them on all my stationery, I was stuck paying the extra monthly fee ($180ish/month + another $60). Otherwise I would have looked like a jackass to my clients for "moving" and then immediately changing my telephone numbers again, so I stuck it out. In the following 9-ish months, I got double-billed or invoiced for stuff I didn't order numerous times, which required many time-consuming phone calls to customer service to fight with them, all the while paying an additional $60/month for the "additional minutes" I was using on their 212 number. I suffered through it, and eventually downgraded my account with them to $00/month when I got a Skype number to avoid their usury phone charges. Then, when I was about to cancel my service completely last month, I was then informed that I had to give 30 days notice, or else I was going to get charged again! I was so pissed. I called customer service and got the broken record treatment from one of their annoying reps. The overly perky customer service rep just kept telling me that that was their company policy and there was nothing she could do about it. My electricity provider, cell phone provider, internet provider, health insurance provider, etc, etc, etc. don't require a 30-day cancellation policy and they are supplying utilities and health care to my self, my home and my cell phone. Why should DaVinci Virtual require 30 days to get rid of the hanging file folder that they collect my mail in? I shut down my checking account in order to prevent them from this usury overcharging. After attempting to collect my last $100 unsuccessfully, they are now claiming that I owe them a $50 late fee! I was only paying them $100 to begin with (after I downgraded my account). These people are like a cancer. I can't wait to see what else they dream up to charge me for. They have the BBB logo on their site. They are awful to deal with. I hope they go out of business. They can chase me around for that last $150 until the end of time. I will never pay it! I don't care if it f***s up my credit. General principal is worth more than credit rating points!!!!!!!