unsolicited phone calls

Purchased a vehicle from Guaranty Chevrolet, Junction City, OR, 18 months ago. Bought extended warranty ($135 per mo). A couple days ago, I was driving my vehicle and all of a sudden it started clanging and banging. Had it towed to body shop for repairs. Surprise, surprise - water pump broke, timing belt came off timing belt tensioner, parts caused vales to jump into pistons. National is claiming that this is NOT covered in my policy. Uh, EXCUSE ME?!? What the hell am I paying for? However, the woman at guaranty that signed us up for this BS warranty said that the water pump and timing belt were covered! So, here I sit without a car and making payments of $300 on remaining balance! DO NOT PURCHASE EXTENDED WARRANTY, they never pay for any damages.
Oh, timing belt kit was not due to be replace for another 12, 000 miles. I have just under 3, 000 miles that I put on the vehicle since I bought it!