Old Singer and new Singer are not the same companies
That is really, really sad. That guy has probably doomed dozens of machines to untimely demises.
As for filing the complaint with Singer, I think most people don't realize this: The current-day company called Singer has practically nothing to do with the Singer of old. The original Singer was broken up in the '80s and the brand-name was passed around between a couple of buyers, until a holding company finally bought it and start selling cheap, made-in-China plastic junk under the Singer name.
There is absolutely no connection between the modern-day "Singer" and the Singer Sewing Machine company that made the vintage machines we all love. The marketing people at the new Singer like to pretend it's been one continuously-operating company, but that's not the case. That's why, when you call the company now located in Tennessee to look up a serial number, they don't know any more than you do; they're looking at the same websites we are to look up a model number.