Ball Joint problems of the 2001 Chrysler Town & Country

I have a 2001 Chrysler town and country. I have had it for 7 months. From the time I brought it home we heard a knocking/rattling noise in the front and the steering wheel was whining. We took it back where they supposedly replaced the alternator, water pump,both bushings and the rack and pinion. The noise was still there after, and the mechanic told us that it was a 500 mile break-in period. Then approximately 5 to 6 months later my heat goes out and still the previous problems from before are there. We took it back where they replaced steering pump and ball joints. They were supposed to put 2 new lines on for the heat when instead they put 2 one foot pieces of black rubber hose on and clapped it on both ends covering the leak. On top of that they put the wrong antifreeze in. I have heat whenever it wants to work. Now the dash light works whenever it wants to work and I still have a knocking noise on the front passenger side along with the whining in the steering wheel. We took it back where I purchased it and the mechanic told us that they saw that some kind of ball bearing had a little bit of play in it but they didn't replace it, then because we called the van a lemon we were told to get out and they refused to fix anything else. I have 3 small children under the age of 5 who are with me most of the time. I feel that this van is a danger to myself and my children.