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Did you have the tank closed during those three days or did you leave it open? If you left it open you most likely have the dreaded paper pyramid. That being a dried out pile of pooh and paper that is going to be time consuming to remove. If it was closed and you are sure it is still full and you are not relying on the gauges that never work, you may want to ask if anyone threw anything other than toilet paper in there. Feminine napkins or baby wipes are prime reasons for plugging black tanks. There are several products available that can help clear out the clogs. I suggest you contact you local RV center for advice on what works best.
Good luck.
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