It's Sytner Mercedes-Benz reservations central team, They're really lovely and are usually calling about a service or MOT on Mercs taken to sytner MB dealerships e. G Newcastle, Milton Keynes, Bath etc - they explained to me that they don't leave VM's unless a very important callback as there are only four of them on this particular team, And therefore wouldn't be able to manage the level of calls being returned. If you call them back they will happily tell you why they called.