Sounds like Chameleon plant, Houttuynia cordata. Do you have a picture of it?
There are a few of us here who have had the misfortune of battling this plant. If that is indeed what you have, topical sprays will not get rid of it. It regrows from a mother deep in the ground. You have to get out ALL the roots. And I mean ALL of the roots. When this plant finds a situation where it is happy it is uncontrollable I'm sorry to say.
