what do i do?

i have a D&G sold bangle watch, where the bangle has come away from the face. D&G want 100.00 pound to fix it. i only paid 120.00 for it 5 years ago. the screws have snapped in half and are actually still inside the hole where they screw in to. i have taken the watch to 2 watch shops, but said they both said they don't have the tool to take the snapped screws out to fix. can anyone give me some advise on where i can get it fixed as i don't want to pay 100 pound out???