I believe the best place to seek for help is at the respective public department of your city/province. I know it as social assistance or welfare department. The employees working there will guide suffering individuals to proper treatment, what doesn't include only gambling addiction, but also any other kind of addiction or social problem as well.
These employees are supposed to know better than anyone else what are the treatments disponible on the region and can also work as middlemen between the citizens and the clinics, spas and doctors.