Squeak from back of car

[Danfox23]

I've had this squeak from back of my car for a while. I take it to the garage every 2 weeks to get the 'dry joints' sprayed but it still comes back. They have said it's only dry joints and that nothing needs replacing. I have attached a video. If anyone has experienced this I'd love to hear from you.

thanks 

IMG_0099.MOV

[Lazlo Woodbine]

I don't know the X-type suspension, in fact I've never even looked under one. However, seeing from your video how easy it is to make it squeak I wouldn't have thought it too difficult for the garage to spray each joint in turn and then bounce the car before spraying the next one until it stops. That would tell them which one it is shirely?