Strategies on appealing unreasonable Health Insurance Charges

Hi Everyone:

I graduated from school in the end of September and did not get insurance until October because I was unemployed. But since I live in Massachusetts (insurance is mandatory here), so I got a cheap one off the internet. This company is SASid, insuranceTPA.com.

One day after the policy got activated, I got seriously allergic skin reactions, so I was all swelled up and needed to go to a PCP immediately. So I started calling the ones in the network and no one would accept/see me on such short notice. I had no choice but to go to MGH's walk-in clinic and they referred me to a dermatologist immediately on urgent appointment.

I consider it an emergency because the doctors there put me on steroids for 4 weeks to shut my immune system, biopsied my skin to check for vascularitis (life-threatening), and I had to use other medication and go back for a followup. So in all, I had 1 walk-in clinic, 4 specialist visits (they were referrals) in a span of 30 days since I activated my policy.

I wanted to know my co-pay so I called the insurance company's number and they assured that I would have to pay $50 per visit. I can afford $250, but that's a stretch for me too.

Now for the horror: This insurance company now sent me a bill for over $3000, saying:
-I wasn't eligible since I got sick less than 30 days of when the policy started (code 143)-Is there any way to go about this? I had no idea of the limit when I called the toll number up.
-doctor's office visit or clinic does not constitute an outpatient surgical facility per the outpatient surgical facility definition in the policy (code 204)-But I can't get an appointment!

I need serious advice from anyone out there on how to appeal/reduce my bill because I cannot afford to pay over $3000 for medical treatment!
Also, does calling the hospital work? Do I have to call the doctor that saw me for documentation?