Cahunas

I am having proprietary issues with my poems. Twice in the last week I have had editors take ownership in ways I have felt were inappropriate, the most grevious example being the editor of a regional glossy rejecting my submission to said glossy and the taking the liberty to 'accept' one of the poems for his literary journal on the stationary of said glossy. I think I actually screamed out WHAT THE FUCK in the Post Office. But it's a little poem, and I don't want to alienate myself from said magazine, so what do I do? What a kick in the teeth.