Astra convertible roof failure?

First try checking the electrics, Starting at the fuse and relay then on to the switch on the centre console if it's none of these it will most likely be the hood motor. I'm afraid the only way to check this is to remove the motor and have it checked.

Vauxhall Astra Soft Top

This is why I don't and won't ever have a convertible.

Roof failures or leaks seem to be frequent problem on convertibiles... and can be costly to fix. Your older Astra might not be so bad on the wallet. GL.

You need the Vauxhall Astra Workshop Guide (with the body section in it).... this is the manual that the mechanics themselves will follow at bodyshop.

You have been very unlucky, unless you know a friendly expert in convertible expert you are messed up.