Has it got the clutchless compressor or the clutch equipped one (have a look in the engine bay and tell me if there's a wire coming from the compressor's pulley or a wire coming from the compressor's back)?
If yours is the clutch equipped one first check if the front part of the pulley (the clutch hub) is rotating when AC is on. If not, bring out a multimeter, unplug the clutch coil terminal and check for resistance on the compressor side. It should show a reading between 3 and 6 Ohms (a new clutch coil in my possession shows 4.3 Ohms in this moment).
If not, the clutch coil is open. Very common with the Delphi CVC compressor, also happened on my Agila A with the 09167048 CVC clutch equipped compressor, it's a thermal fuse on the clutch coil which goes open. It's supposed to save the serpentine belt in case of compressor seizure, but can apparently go out earlier than it should, since my 15 year old compressor is still doing its job wonderfully after receiving a new clutch coil. I personally don't recommend bridging that thermal fuse, since it's there for a reason, but the aftermarket coil in my possession doesn't feature one.
720 kPa sounds like your compressor is pumping nothing, provided ambient temperature is around 28°C. 720 kPa is in fact the approximate static pressure of R-134A refrigerant at 28°C. If you want to test refrigerant static pressure vs ambient temperature by yourself, look for an R-134A Pressure vs Temperature chart on the net. Remember that the pressure transducer is located on the high side and that there's no low pressure sensor or switch at all when the compressor is of the variable displacement type.
Static pressure won't tell you nothing about charge weight though, unless the charge weight got very low (and i'm talking about charge weight because systems featuring CVC compressors have to be charged in terms of weight, since the compressors have a valve that adjusts the high and low pressures to optimal values, so never think about charging it up by yourself with canned refrigerant).
If instead you have the clutchless compressor, well, it's a different kettle of fish.