1997 GMC K1500 User Comment / Complaint

Persistent failure of windshield wiper operation under normal vehicle operation. this led to lack of visibility through windshield. there is a well documented recall of the wiper module assembly for gm trucks/vans. my truck is a 1997 gmc k1500. when i took my truck into the dealership, they informed me that my particular vin was not included in the recall vin range. there is no doubt my truck has the bad parts illustrated in the recall(s) (eg, ea02006). my complaint is that it should be included and fixed by gm, and that by some sort of vin technicality or error, they refuse to fix. what is my course of action to rectify this situation?