Bit confused

I got a customer who has a bath & there’s a full length glass enclosure along it. The enclosure sits in the bath & is a frame. I need it off.

The top & bottom rails like a shower enclosure is screwed into top & bottom. I thought it would be like a shower enclosure where you screw 2 lengths to the wall & then the rest screws onto it with screws. There are no screws! My issue isn’t damage as it’s being scrapped. I don’t even mind leaving the 2 ends screwed to the walls. I just need the glass doors out, which I’ll force but the top & bottom rails off. I was thinking my hack saw will be used.

Any thoughts on this? It’s gone in somehow so must come out.

I’ve got no pics unfortunately

Cheers all