If you want to simplify communication with your customers, cut out the jargon.
While a certain level of jargon is unavoidable (e.g. for product names like ISAs or for Government Regulations), it generally gets in the way of clear communication.
A good way to cut out jargon is to add jargon words onto the call scoring sheets. You then take off a couple of points for every piece of jargon.
But it may not be just the advisors who speak jargon. At one call centre I heard about, whenever somebody spoke in jargon, the call centre manager replied to them in French!