Repairs to an installed roof by Hartig Roofing

Greetings I Hartig roofing installed my new roof at my premises about five years ago now one of the pieces of facia board has broken off and I need to contact them to find out how it can be repaired as I have 15 year guarantee on the roof. When I dail the land line numbers I get the message that the number does exist anymore and the cell is not answered.