I'm so sorry - but the WEP is not something that can be contested unless you think that it does not apply.
The Windfall Elimination Provision is a statutory provision in United States law
which affects benefits
paid by the Social Security Administration
under Title II of the Social Security Act - enacted as part of the 1983 Social Security Refinancing Act, designed to shore up the financing of the Social Security Trust Fund.
The bottom line there, is that if your wife is receiving benefits from any work where she didn't pay into Social Security, the WEP applies. (The exception to that is when she has 30+ years under Social Security as well.)
You are doing the right thing in requesting the waiver. Although, they are aggressive in identifying these non-social security pensions
, they grand these waivers often.
One thing to watch - we have had several, and seems to be growing sentiment toward, items of federal
legislation introduced to eliminate the WEP: http://www.rseala.org/federal-legislation-to-repeal-windfall-elimination-provision-wep-introduced/
Please let me know if you have any more questions.