Won my promo's but didn't promote

So I reached 100lp with my syndra and got into my promo's and the notificaiton popped up you have entered your promo's here's a free win. So I Win my next game with Veigar and i only have one win still and i didn't promote.

I know i could play another you know and try and win, but it sucks having a full time job and climbing you know!

Thanks!