Hi Saitha Wils,
You can find replacement top and bottom section frames for the LG V20 on Mengtor, SST parts, and eBay. I have included the links below but I do not know how long they will be active. If the links expire, search "LG V20 replacement parts" and the most common part that pops up are the top and bottom section frames. Hope this helps!
http://www.mengtor.com/product_show.php?category=1617&pid=24614
https://www.sstparts.com/group.php?gId=225
https://www.ebay.com/p/?iid=252858894655&lpid=82&ul_noapp=true&chn=ps&var=551874562568