PVC Window handle sheared off... how do I remove whats left so I can fit new handle?

they are probably rivots u can get a chisel and hammer and knock it off with some force but that may damage the window or try a hacksaw blade..this will cut through but will be time consuming but will save the window from any damage

You need to try to figure out the manufacturer of the product if you can. Call the local glass supply shop and they can almost always get you replacement parts, and they generally know how to remove said handle. Also they will generally come out and give you a free estimate.

you're gonna have to get somebody to get the rest of the handle off if you can't get it off yourself hope this helps