I cannot see why the company which replaced the glass window should feel responsible for removing broken pieces from inside the cover mechanism. After all, they didn't break it.
However, your best bet would be to ask your local dealer if they can help. They will know how to take apart the cover mechanism.
When one of the end caps came off my cover, the service chaps at my local dealer said they would have a look at it for me, and they managed to replace the end cap after tensioning the cover.
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