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Get a refund.

I leave a phone plugged into my car's USB port 24x7 and the car has its own GSM modem too and obviously it starts right up every time.

The difference is that you're using a USB port directly built into the car (which is "smart" about not draining the battery) while the other user is using a cigarette lighter to USB adapter (the cigarette lighter is a "dumb" circuit).

getting your battery tested might be useful too.

If it's not a car from the 80s there may be a fuse you can add/remove which converts your cigarette lighter from always on to only when engine is on. Check the back of your car manual.