How do you beat mordekaiser?

I had a 20-30 cs lead over him and was 1 kill ahead, then after we both went back and came back to lane i literally couldnt deal any damage to him, its like his health bar was barely changing, and he just kept pulling me in and following me with his stupid circle. Then he just scaled harder in late to the point where he was immortal unless we ganged up on him 3v1. HOW do you beat this guy??? (gotta mention i was playing TRYNDAMERE, had full rage and an infinity edge and this guy destroyed me after getting his first item)
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