Making FPS bigger and speeding up video

Hi, i recorded video in 60fps, but the camera automatically converted video in 29,9fps, so it made the video slow-mo. But now i want the video in original 100% speed and 60fps (í want to use twixtor at some parts, so 60fps is needed). What should i do? I use after fx 5.5 and sony action cam.

Thanks

adik6555