tax resolution services Took $4500 from me Encino, California

I hired this company to help me with my tax problem, they said they could help but needed $4500 to get started. I sent the money to them and they now want more money and I don't have any more money and now they wont even call or take my calls or replay to my e-mail's. This company has not provided 1 ounce of help in my case, I made a big mistake in using this company, I asked for a refund and they wont even call me. If you want tax help don't use this company because they are a rip off. I should have given the money to the Irs instead of this poorly operated company. Here is what they say they do:We are Specialists in Solving Tax Related

Collection Problems. Our services include:

Offers in Compromise Innocent Spouse Relief Abatement of PenaltiesAppeals Representation and DefenseRemoval of Federal Tax Liens Removal of Bank Garnishments Financial Hardship Payment Plans Audit Representation Lifting of Levies on Assets including Wages and Bank Accounts Unfiled Returns Bankruptcy Discharge Analysis

I have not found any of this to be true.