Ring doorbell 3 plus solar charger not working

Without wanting to sound like a broken record, after reading the other messages. I recently bought the solar charger for the ring doorbell 3 plus. Doesn't work. Not even slightly. I installed it inproperly and made sure it's clean of any debris (although being brand new that wasn't an issue), it's in full sunlight for several hours of the day, and nothing. It doesn't even hold the charge. I'm having to take the battery out and charge it up just as much as I was before. Why are you selling a product that doesn't work? £50 completely wasted!