String Trimmers

How come I buy a new weed wacker and within a month it begins to stall out and will not run properly? I ought brand new off shelf and the company tells me it's a carb problem which after buying new should not be the case. Especially since It ran fine then starts dying. Fuel is mixed properly and all


Also how come the company support line won't offer me the actual support I'm looking for ?
Says something about the company