theft

I sent my car in for a check up and they advised me to take all valuables out , I didn't have anything valuable except 6 Energades and 16 bottles of 330 ml cokes( organising a party for a children's home ) , after collecting my car I noticed that I only had 3 bottles of Energades and 4 bottles of cokes......when I called in to speak to the dealer Principle , I was advised that nothing could be done as they don't have any cameras in the service room and it should have been removed, it was drinks and I felt no need to take it out as I assumed no one will ***** from me . Several people called me and advised they will get back to me but up to date no one contacted me