I am so sorry to hear your troubles. I personally wouldn't have a Singer machine if they gave it to me. There is no excuse for their condesending attitude, and I feel really bad for you. There is also no excuse for their attitude and the fact that you have had to send your machine back so many times. I have had my machine for over 10 years and she had to go to the hospital once, and that was user error. She is not a Singer. For the expensive price tag, the machine should work for many years.
Sue