Sounds more like a popsicle stand than a corporation…CEO…sheesh
Sound like OP is: top salesperson, manager, delivery guy, administrative support staff.
Working as hard as a sole owner on a passion startup - how the hell did you get roped into this without sticking up for yourself??? I would politely ask for that massive raise and if declined - f-ing destroy their business as you leave.
If its like here in Canada - your customer had to give explicit permission to UPS to drop packages unattended - subjecting herself to the risk of porch pirates. Does she have 24/7 video to prove the ups photo is fake? no? well then how does she know it wasn’t stolen off her step, which you are not responsible for?