Crankshaft Position Sensor problems of the 2005 Mercedes Benz E320

Bought used one owner car w/88,500 miles in July 2015. After driving only 200 miles check engine light came on, engine would turn over but not start, it was towed to repair shop. Codes read crankshaft sensor, generator. Mechanic replaced crankshaft sensor and repaired wire to it. Did not replace alternator. Called and advised car was ready for pickup. Picked up car and drove less than 2 miles and check engine light came on again. Took back to mechanic who removed codes. Drove another 5 miles and check engine light came on again. He didn't answer phone, drove home in limp mode where it sat for over a month when another mechanic was willing to tackle job. He put on new alternator and drive belt. Crankshaft sensor was bad again and he replaced it. Car would not start. Towed to mb in franklin, TN who said ecm/ ecu module bad. Replaced it and then said batteries bad, and alternator bad. They replaced batteries but local mechanic told them alternator was working fine when it was put in car. Car towed back to local mechanic who checked and said alternator was indeed bad now and he replaced it with one he checked out again before installing. Now the alternator was not being allowed to charge the system and is being towed back to mb in franklin, TN. After searching the internet I found that mb has been installing defective wiring harnesses in their cars since the 1990's and they know it but will only replace the defective harness to those to yell the loudest because there are supposedly millions on cars on the road just waiting to short out expensive parts and cause owners costly repairs. I am yelling at the top of my voice for you to go after them with a vengeance and make them do the repairs. I have spent over $4000. Already on this car which should have been fixed by them at their expense. The covering on the wires gets brittle and shorts out various. .