What site did you purchase it on? Different sites have different rules. I would imagine that you could also contact PayPal and tell them that the DAC was not as described and they will reverse the payment.
Who is Liable with Defective Unit
Purchased a used (10 yrs. old) DAC on internet...was represented "as new", in perfect working order. Arrived OK, packed well, etc. Plugged in and unit would not respond to remote input. Works with manual input. Remote is OK...can see IR pulses with my phone camera. Sent to factory repair for analysis...PCB problem. Seller will only agree to pay 50% of purchase price if returned, which is also about 50% of the repair cost...claims unit was just fine when he sent it. Pay Pal transaction. What remedies do I realistically have?