Sceezoe

Hi all. I imported videos recorded from my phone and a dashcam. Made it into one synced video that was hoping to export as a 1280 x 720. The only options were Letterbox and Crop & Zoom. After exporting either, the result is not what I want. Somehow, it is taking the vertical video from phone (so the videos recorded on the phone was fine), but when it switch to the dashcam video, it is squeezed into the width of the video phone recording width. Meaning it's smaller than what it should be. How do I avoid this? I don't mind black bars. I even put a black dummy image at the background hoping it will act as an anchor for the whole video. Please help.