Norman,
Sounds to me like you have a roof/and or guttering problem, which WILL mean a reappearance of damp if the problem is not found and sorted.Also needs checking where the gutters actually run into, whether a proper drain or straight onto the ground.
If the property is only 1 year old what kind of guarantee did you get from the builder?
Also in the Bodrum area a lot of the properties have uncovered flat roof terraces, if these dont have a slight slope to them, sealed properly and damp proof membrane incorporated then problems WILL occur.
There are a lot of cheap (£30-35,000) properties available on the Bodrum peninsula built 4 to 8 years ago which are not up to modern spec and need £10-15,000 spending on them because of the problems that you mention but on a property as young as yours you should be gunning for the builder.