Please tell me if i can use this song and it's title in my promotional film?
For this, you'll really need to see a lawyer to determine if the original re-mix has sufficient rights to the song to place their remix under Creative Commons in the first place.  

If they do, then it depends what Creative Commons license they used.  As long as it allows commercial usage (not a NC license) then you would be ok as long as you followed the rest of the terms of the applicable Creative Commons license.  (For example, you would need to post the video under the same type of Creative Common's license.)