From the moment you tweak your settings and make them publicly available in terms of privacy and friendship, you will be exposed to all the users who access Snapchat. This could be the reason why you received friendship requests. Secondly, tune your privacy and deny any friend request unless you initiate the procedure and that's it. There is no need to fight as this is a simple setting that needs to be changed. If you added someone, it should appear on your friend's list and all the requests should be seen there.