IWC Aquatimer, wristband issue

[Stiffan]

Hi everyone!
Iwould love to get some wristtime with my IWC Aquatime, but I simply cannot fix the wristband at the watch… the „cramps“ which should hold the bar can‘t be moved- the TD send me a second band but the problem is the same.
Anybody any idea? Thanx a lot in advance
Stiffan