Sorry, No Truck Here

Went to Home Depot and picked up more drywall and a handful of doors, then went to rent their truck and was told it was rented, even though I could see it sitting there in front of the rental center.
Could not get any kind of straight answer about when it would be available. “Is gone all day.”
So I put my stuff in ‘will call’ and I’ll try later tonight, not sure what constitutes all-day for whoever has it.