Rebuilt long block

Bought long block off ebay and had professional certified mechanic install it. Ran 1 minute and got coolant in cylinder. Called and they said to send it back. I just spent $1600 on engine & shipping and another $2000 on misc new engine parts and labor. Now they want me to pay my mechanic to pull it back out, strip it down and pay to ship it back so THEY can look at it. Then I have to pay once again to ship it back to me, pay my mechanic once again to install it and hope they got it right. This is why they don't offer a labor warranty on ebay because the know nobody in their right mind would do this and therefore doesn't check for quality but sends out junk instead. Worst company I have EVER dealt with and for all you potential customers spend your hard earned money elsewhere.