Talk with the IRS
 

IRS Hotlines and Toll-Free Numbers;

A consolidated list of frequently requested phone numbers and hours of operation including Practitioner Priority Service, IRS Tax Help Line for Individuals, Business and Specialty Tax Help and e-Help.

http://www.irs.gov/businesses/small/article/0,,id=161104,00.html 

Contact My Local Office

IRS Taxpayer Assistance Centers are your one-stop resource for face-to-face tax help and solutions to tax problems, every business day. 

http://www.irs.gov/localcontacts/index.html

Stakeholder Liaison (SL) Local Contacts

Your local Stakeholder Liaison office establishes relationships with organizations representing small business and the tax professional community and providing information about the policies, practices and procedures the IRS uses to ensure compliance with the tax laws. To establish a relationship with SL, use this list to find a contact in your state.

http://www.irs.gov/businesses/small/article/0,,id=153991,00.html

Taxpayer Advocate Service

The Taxpayer Advocate is an independent organization within the IRS.  They help taxpayers resolve problems with the IRS and recommend changes that will prevent the problems.

http://www.irs.gov/advocate/index.html

Reporting Tax Fraud

If you suspect or know of an individual or company that is not complying with the tax laws, you may report this activity by completing Form 3949-A. This article provides additional guidance on submitting the report.

http://www.irs.gov/compliance/enforcement/article/0,,id=106778,00.html