party_pants said:

We had an issue a few weeks back with our skip bin company. They charged us for being 400 kg overweight. We disputed this, the bin collection that day was nothing out of the ordinary. After a bit of back and forth they reckoned their automatic bin weighing and logging system is fool-proof. Anyway, we ended up paying it just to keep the peace. We need these guys on an ongoing basis, and they are the cheapest option. Switching to another supplier is going to cost more anyway.

Fool-proof, maybe.

Idiot-proof, probably not.