Were you hooked to 120 volt power at all???
Do you have any solar charging capacity??
What was the refrigerator being operated on, propane & 12 volt, inverter and 120 volt????
If not hooked to power and no solar charging the 4 days is probably right.
My coach has about a 4-5 amp parasitic draw with no charging so I could loose +100 amps a day. I have 325 watts of solar charging which will maintain batteries, run the frig on propane/12 volt, exhaust fan, and use some 12 volt lighting. If I turn on the inverter to watch TV etc during the day the solar charging will maintain but at night it will draw down the battery quickly.
My previous RV was a Class C, the battery would drain overnight.
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi