Brake Abs Warning Light problems of the 1998 Lincoln Town Car

I have had a brake problems with the front brakes they kept locking-up and smoking 1 first round they changed a front right hub and sensor, that lasted about 1 mile that was around $425. 00 dollars. Picked up the car drove it home 1/4 mile the abs light came on. This time it had to be towed back to the dealer. Car sat for one week because a tech was on vacation! then I got a call from my service rep and gave me price around $3200. 00 for the repair. After thinking how much money I put in the car over the years I gave her the go ahead to do the work. Another 3/4 week went by the job was know completed so I picked up the car drove it to work. Again it did the same problem the front wheels locked-up but this time I drove & made it to the dealer. I called ahead of time so she was waiting for me to pull into their yard. She saw the smoking pads so I asked her to drive the car and it just bearly moved because the front wheels were locked-up. This time a day went by and I was told it needed another part but they would do it for cost. I asked for the service manager cortney to look at my bills and do the right thing on my invoices. There was no charge for the last job . 1st bill = front hub and sensor $ 420. 00 2nd bill = abs pumpasy /hoses assy-frt and rear brk/caliper hoses/kit-brk anti/lk v/blk abs module/brake fluid/470 cpm/labor $ 3463. 14 3rd bill = $ 400. 00 after conversation with service this was waived. I spent almost $ 4000. 00 on parts and labor on my car and it did the same thing until they changed the booster pump behing the master clinder could this have been the whole problem? I have saved the parts do I need to have them tested for proper operation? I feel a refund for the trial and error should be given because if you look at my ro's the list is about 6 feet tall. I am a good customer and I have spent a lot of money at the dealer over the years but this time I am upset.