Does anyone else have issues with people using their account?

I don't know if someone was watching me over my shoulder, heard me give my phone number in the drive-thru, or just randomly guessed until something worked, but I keep having random people using my account and taking my Free Sip Club drink and other rewards when they're available :( Why does Panera not have a pin or something to use rewards? I live barely above the poverty line and like to accrue awards slowly (especially with gift cards from holidays) and use them all at once to treat myself... this just sucks. Thanks for coming to my TedTalk.