To me it looks like it can pull a 700 kg load before tearing, and safely carry a 140 kg load. There are different forces at play for each action there. Think about a tug of war, you can pull a lot of men but there's no way you could carry them. When you carry a load you have to resist the entire force of gravity, when you pull a load you only need to provide momentum, and resist friction, if any.
Ah yeah good point, so the number you want to use for hanging is going to be 140 kg. I believe the store owner wouldn't know the difference because not everyone has studied the same things(mechanics).