work your way up the chain of command - the guy on the end of the phone
isn't allowed to refund you after the cut-off date his boss may be.

I agree.
i talked to a manager. He refuses any arrangement.

seek legal advice - you may have rigthts beyond those granted you in
their guarantee,

Chipsource knows that a legal solution is complicated from a foreign
country. Sueing them for only around 700$ could cost tenfold this amount.

Thanks anyway for your answer.

I just wanted to warn purchasers to be careful with the guarantee terms of
Chipsource.

They have disposed of an old stock of defective parts with us, but other
"victims" could be more careful.

Denis