The maximum amount charged depends on the district. So called "paralegals" do not have any greater rights than a member of the public. They are not authorized to work for the general public and must only work under the supervision of an attorney. Call the U.S. Trustee's office in district where your BK has been filed and prepared. They will have an answer to your question and investigate if the fee is excessive or the petition preparer is not authorized to prepare petitions. Good luck.
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Here in central district, the most you can be charged by a document preparer (and yes, this includes paralegals no matter some of them think they are quasi-attorneys), is $200. Only an attorney can represent you other than yourself, so the paralegal could never go to court or your 341 hearing with you.
Southern District which includes San Diego and Escondido--$150. Here in the Central District the maximum is $200. That said, BPPs that give legal advice are practicing law without a license. The Office of the United States Trustee can give you more information.