No you don't. Just because you pay for Ökostrom or whatever doesn't mean that the electricity you actually use was produced by renewables. It's one grid. You use the electricity produced by coal plants just like everyone else.
Only if you
a) Pretend that the electricity you get doesn't come from the same grid as everyone else's, where the input to that grid is a mixture of renewable and non-renewable energy, and
b) Don't look too hard at how many others make that same boast: Being "green" is "in", so lots of people's consumption "is completly covered by renewables"... Perhaps a larger proportion of electricity consumers than he proportion of electricity actually generated by renewables?
I mean, if you can happily -- and unthinkingly -- echo the empty promise on your electricity bill, so can everyone else.
Your claim is point-less.