Am I the only person to have had the plastic lock/catch, that unlocks and locks the charging port on the front of the car, (the audi rings), fall off? I've lost mine! And I can't find a replacement online. My audi garage says I must order a whole new part - I'm assuming they mean the whole front casing - but I just need the button-sized plastic catch. Has anyone any knowledge of where I can pick up this elusive part? Thanks.