Q: car wont start

i have 2005 chrysler pacifica. it has 160K miles. had front end MVA 10/2015. had many troubles since. stopped while driving in jan, had flywheel replaced. it ran, but was not quite right. my husband told me to take it back, but busy with work and i hate dealing with them, so didnt. in feb it stopped again. now im tired of dealing so i just got a new car. trying to get this one repaired so its not just sitting. had mechanic come. said it may b shaft sensor. was all scratched up. replaced it. still not starting and new one looked the same withing a few tried to start. he said flywhell is hitting it. told him we just recently had replaced. he said take it back to them. was either wrong size or not installed properly. had it towed back up to the original shop. now they say it is something electrical. i think they just dont want to fix their mistake. please help me! i am already out soooo much money on this.

My car has 160000 miles.
My car has an automatic transmission.