I would stay on autofill but make sure to prebuy enough gas to get thru the winter. The advantage of autofill is if you run out somebody has to get out of bed and fill your tank at night. Price wise autofill normally is cheaper. If you prebuy your gas it always autofill unless there is a locked gate or something that keeps the driver from delievering. The advantage of owning your tank is the ability to use different companies. The disavantage of owning your tank is if something fails on it its your problem. By far the best service propane companies offer is the prebuy plans.
There is another serious issue here. The driver falsified your gas ticket. He probibly falsified his driver log and manifest also. He could lose his CDL for this.