I never trust the live levels personally (not saying there is anything worng with the systems before somebody shouts) ... I prefer to speak to a person so will always ring. The people can read what is on the shipment note for the latest delivery ... the computer can't so has to wait for the people to enter the data so items that aren't shown on line might very well be in stock, just not yet unpacked.
The the words of the old BT adverts ... "its good to talk"