Yeah, you got sold a bike with a cg200 engine. They have 68.5 to 69mm cylinder skirts and 15mm wrist pins. A CG250 is a 73 to 73.5mm skirt and a 16mm wrist pin. Measure the bore on the old cylinder, if it is around 63.5mm, you have your answer.
Also, if they have the bore and stroke for the bike listed on their website, screen shot it and make sure that it can be identified as their listing. If they won't make it right you have a case for false advertising/fraud. If you paid with a credit account, this is where you could involve the bank.
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