SEOUL, April 1 (Yonhap) -- Renault Samsung Motors Co., the local unit of French automaker Renault SA, said Monday that its March sales dipped 3.3 percent from a year ago due mainly to a slump in domestic and overseas demand. Renault Samsung sold 12,509 vehicles in March, compared with 12,931 units a year ago, the company said in a statement. Still, its March sales jumped 7.7 percent from the previous month, according to the automaker. Domestic sales fell 0.4 percent on-year to 4,769 in March, with exports dipping 4.9 percent to 7,740 vehicles, it said.