I've found a mint way of dealing with em - keep the bastards talking! Get them to explain every minute detail 5 times over, involve other people - get em to explain it all over again to at least 3 other people before getting back on the phone asking em to explain it again. Tease the fekkers, make out that your going to buy but then just at the last second get them to explain about the Other products again - repeating the above steps as much as possible.
Bottom line - if you can get em to hang up on you they will never call back!
