National Tire & Battery [NTB] review: tires

I have "several" issues with this store and company. I purchased new tires last year along with the warranty. I have had nothing but issues with the tires and the service of the store.
I am currently sitting in the store for the 3rd time addressing the same issue! The front driver tire is defective and instead of replacing it the store keeps patching it up! What's the purpose of a warranty if you dont honor it and "replace" the defective tire? I travel for work and I can't afford nor do I have the time to continuously put air in a defective tire but most importantly it's not SAFE!
Second issue is I made an appointment online just to find out that the online system is not working! So again, I am sitting in the store waiting to "see" if they can get to my truck. I was told that the online service doesn't work and the store is booked until Sunday. Totally UNACCEPTABLE! I leave to go out of town tomorrow and the last thing I need is to come home to a flat tire after vacation. I am sure the store will "patch" the tire up again instead of replacing it.
This has been the worse customer service experience ever. I have also filed a complaint with the Better Business Bureau and corporate.

Thoroughly Disappointed,

Chanel