1990 NISSAN 300ZX Engine And Engine Cooling Problems

IN DECEMBER 2008 I BOUGHT A WATER PUMP FOR MY 1990 NISSAN 300ZX FROM ADVANCE AUTO PARTS IN MAULDIN, SC. IT FAILED WITHIN FOUR WEEKS, CAUSING MY ENGINE TO OVERHEAT. I HANDED THE DEFECTIVE PUMP BACK TO THE STORE PERSONNEL. A WEEP HOLE IN THE SIDE OF THE PUMP WAS SPURTING OUT WATER, AND THE SPINNING PART WAS CHEWED UP. THE STORE PERSONNEL TOLD ME THE PUMP WAS VISIBLE DEFECTIVE. THE STORE GAVE ME A RECEIPT FOR A REPLACEMENT PUMP, WHICH I PICKED UP FROM AN ADVANCE AUTO STORE/PARTS WAREHOUSE IN SPARTANBURG, SC. WITHIN THREE WEEKS THAT PART FAILED, MY ENGINE OVERHEATED, AND WAS DESTROYED. INCREDIBLY, THE STORE AND THE REGIONAL MANAGER TOLD ME THEIR SYSTEM HAD LOST THE FIRST PUMP, WHICH THEY HAD SENT BACK TO A REGIONAL PARTS RETURN WAREHOUSE IN GEORGIA. THEY WANTED THE SECOND PUMP, BUT COULD NOT GIVE ME A NAME, POSITION, OR DEPARTMENT THAT...