Terrible blunders by Thibault Courtois and Gary Cahill saw Chelsea on the brink of being beaten 2-1 by Swansea but Costa rescued his team with a spectacular late equaliser.
Costa got some severely rough treatment from Swansea defenders Jordi Amat and Federico Fernandez,but being Costa he gave as good as he got and had the last laugh too eventually.
Conte was pretty bugged with the ref overlooking all the rough stuff.