Wheeling Subaru review: Had service to my subaru, but they didn't state other problems that needed addressed

Took my Subaru for dash lights to be checked. They fixed those, along with water pump, timing bet & other belts, spark plugs. While they had the car on hoist, said head gaskets leaking. They told me that 2 years prior with no symptoms of any problems. While car was on the hoist, they never mentioned there with other more serious problems like no break in the rear, exhaust needed to be fixed and most important - the main frame was almost rusted through. If I had known these things were wrong with the car, I would have never let them do the engine work. It cost $3,236.17 and the car was not safe to drive. I feel I should be refunded this amount. I had to take to another dealer out of state to find out about the car.