Power Steering Pump problems of the 2008 Cadillac CTS

Steering has become hard to turn been in shop 6 weeks replaced rack and penion and power steering pump now will not start.

While trying to park, the steering wheel becomes stiff. I took it to the dealer to correct problem and it cost me $2,558. 35 to replace steering pump and to get a wheel alignment. A week later I had to take the car back to the dealer for noises after applying the breaks and they had to replace both control arms and stabilizer links to correct problem. That job cost me $1,362. 93. In April 2013, my front passenger door handle didn't open from the outside. The dealer had to replace the inside door handle housing split, trim pad and handle housing. This job cost me $1,376. 99. Not sure why I'm having all of these problems when I get all the required maintenance and all jobs are done at a gm Cadillac dealership.