Starter problems of the 1999 Chevrolet Tahoe

The battery in my 1999 Tahoe has started leaking from the postive post and has done $ 480 damage to the cables and starter motor. The service rep said that it had been leaking for a while. I had it in for service just 10 days before, and nothen was said about a leak. Reailable said that the battery is a 6 yr. Battery, but when it is put into a new vehicle the warrenty is for 3 yrs or 36,000 miles. He said that delco has a problem with their side post batterys and they are changing out a lot of them, but because I have over 36,000 miles, I will have to pay for my work. When I bought the vehicle, I was told that it would not need a tune up for 100,000 miles and it has a maintance free battery. Here it is 28 months later and only 59,000 miles and the battery has done $480. 00 of damage, and I find out it is happing a lot with delco batterys. This can be a hazard, because the acid gets on driveways and kids play there. When I bought the vehicle, I ask fro a gm extented warrenty. I paid $540. 00 for this and now I find out that I got some other warrenty, not the gm one and it doesn't cover batterys. What is the consumer suppose to do. I have had the regular maintance require by gm done at reliable and only 10 days eariler it was in their shop for oil change and greased and I was not notified of this damage. Any help you can give me will be appreciated. To make thing worse, I was charged $34. 95 by reliable to run a diagnosis test to determine the battery was leaking from the post. The service rep raised the hood when I carried it in and said it is leaking from the post, this is a problem with delco batterys. I don't see why a test was then ran.