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I have a 3040 with a 400 watt DC spindel motor as well.
My controller is Parallel port configured (printer port)

I use Mach3 to run it and have had no problems once I learned how to properly tune...

I think an exception would be the German made Kress routers that run 29,000 rpm and use brushes.
Never had any problem and have been thru a set of brushes already.
Quality always satisfies.

If...

I am sure the seller was fully aware about the time limit on claims to ebay and Paypal.
That explains the delays.
So many scams going on today it is risky business to buy anything online....

Hopefully you paid with a service like PayPal so you can send it back and request a full refund.
The unit should have been fully checked out before they shipped it but who knows about something that...

I have a Chinese 3040 cnc machine bought from Ebay a few years ago.
It works great!
it has a 4 axis controller with a spindle controller on the front panel.
There is a plug on the back that goes...