Headunit interface? Help

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Used the peripheral interface. The 1st one they sent did not work required a jumper on the GM side which I would not agree to. They reluctantly sent me a newer version. Only after returning the old unit for their checking. This one had the jumper on thier side which enables the onstar and chime functions. Damages...
$129.00 interface
$29.00 chime module
$42.00 2nd day return ship ups
$$$$$ agrivation factor and 1.5 weeks with dash board apart.
PS Thier tech support was weak but customer support ok. however would not deviate from policy of no returns without exchange in hand. Good luck!