Firestone Complete Auto Care review: brakes

I have brought my van in three times to them,
First time : i said brakes dont feel good and are making noise, they told me it need brakes they did a rear brake service and shoes, they said it was overloaded and this was in October 2009, cost me $729.16

Second time was Nov 2009 same companit but I took all the weight out of the van as they told me that was the cause, even though i have three other vans setup the same exact way and do not have this issue, and they are driven by employees not myself. anyway they went on to say the second time was the front brakes, well i said ok and i was charge $653.45.

Now it is January 2010 and not even 3, 000 miles later and the same exact thing is hapeening again, they just told me i need front and back brakes again, $822.06, and they went on to say it is weight, and i told them i personally took all the weight out and this truck is not beat on it is mine and i am the owner, and as I said i have employees that drive and we dont go throught brakes like this, they usally last 1..5years at least,

These guys must have a number of around 600.00-800.00 everytime you go in, they are a ripp off and Firestone should do something about it .