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Window repair? rotten joinery

We are a house wash company that has smashed a window while trying to close it however very thin glass and rotten timber joinery - unsure we are liable for this or if it can be fixed without new joinery? They want it fixed Friday 5/4/24 before photos are taken for sale. Looking for cheap fast repair if its even possible? 46cm x32cm 1mm thick timber joinery ground level with easy access