Global Automotive on Ebay broke warranty and send me defective part Miami, Florida

I bought Oxygen sensor which was defective.I sent hem the email to inform then that the part is defective. They never replied for 2 months.And when they reply they ask me auto info. and I sent it to them.They never got back to for couple of months again.Then I sent quite a few emails and they replied and ask the same ino. And I sent itto them again .It happened 4 times and about six months were gone, and then after six months they said our warranty is foe 30m days.Well I emailed then within less than 30 days. They made excuse for 30 days warranty and delay was on their end.They just rip off off people They never got back to me when I told them that it is not my fault .Delay e\was fron their end.They send defective parts or wrong parts.From Feb. it is now august.And the excuse is 30 days.What a rip off.They will never contact you.RIP OFF!!!!!