Fuel Injector problems of the 2002 Chevrolet 2500

On 10/29/2011 the engine was blowing grayish white smoke. The engine started losing oil pressure. Checked the oil, found diesel in the oil. The oil level was 6" higher on dipstick. It is the fuel injection system on the 2002 duramax diesel. The fuel injectors have failed. I understood that Chevrolet has put a recall on all 2002 and early 2003 models. Took it to derek scott auto park which is the closest Chevrolet dealer/service department. After running diagnostics they told us that the replacement of the fuel injectors would be covered 100% by gm. Later called back and said we would have to pay half in the amount of $2,251. 88. They will not allow us to talk to the gm rep. We need to know if this is valid or not. We thought recalls were paid for by the company I. E. Gm in this case. Thank you for your help in this matter.