As said already its nearly 2015 shouldn't be putting up with this issue in modern motor!
Ive had £300 bangers that dont suffer any of these damp issues
Myself and my wife both have mk5 57 plate Golf's mine Gti hers Gt tdi and never suffer any of these issues
Mine had mildly misty windows few weeks ago but since then i have fitted a new carbon cabin filter and cleared out drain holes under bonnet in wiper mechanism area and is now spot on
All cars suffer slightly in the cold damp weather but for it to be dripping inside and frost inside etc you deffinately have an underlying issue somewhere with water/moisture getting in