I suggest you complain bitterly to the person who pretended to service the machine and don't be shy about jumping up and down and waving your arms around...
Are you using a very thin fabric? If so perhaps you need more pressure, try turning up the pressure wheel a notch. Normal setting is 4 so perhaps up to 5 or 6. But remember to turn it back down when finished.
Go line and type it in or go to eBay and type in the piece you need. They come in different shank sizes but are very reasonably priced so you could get a couple until one that fits your machine. You can always gift the ones you don't need. :-)
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