Global Automotive On eBay — defective auto part

I bought oxygen sensor and was defective. Sent them email right a way after finding out defective part. Received response after about couple of months. They asked for details about vehicle and code. Sent them. Did not response another month. Then again asked for vehicle details (same thing). Sent them again. Did not reply another month. Then after 6 months they said we only have 30 day warranty
Then I sent them the first email details and date. So for never got back to me. Looks like it is rip off.