This sounds like your the victom of a weed wacker. LOL I have fixed alot of these by replacing the bottom row of siding.
This easy to do if to do if you have a zipper tool (side swiper) this unlocks the 1 st panel from the 2nd and you just pop the nails and unlock the damaged panel from the starter and replace with new ones. This tool will also zip the two panels back together.
Or if you can get your hands on an alum. break, you could make a custom cap or flash, and pop rivit this all along the bottom row. Then you wont get any more chiping.
Be safe out there folks.