Welcome to Just Answer and thanks for your question. I'm sorry you've been waiting so long. Other than using the appeal process within Kaiser, there is no way you can "force" them to fill your prescription. The amount that can be purchased at one time is set by Federal statute. Pseudoephedrine comes in brand (Sudafed) and generic 12-hour extended release formulations that contain 120 mg of pseudoephedrine per tablet. They are commonly available in 10 and 20-tablet packages. A one-time purchase limit is 92 tablets of the 120 mg formulation. Four 20-tablet packages plus one 10-tablet packages would be 90 tablets that should hold you for 45 days per purchase and be within the law.
The Methamphetamine Anti-Proliferation Act (MAPA) limits the thresholds of pseudoephedrine drug products to 9 gram single transactions with the package size not to exceed 3 grams.
(Title 21 U.S.C. 841 (c)(2))