Airbag recall campaign Toyota Corolla

Just yesterday I took my car for an airbag recall to the Corolla in Hyde Park... They did the airbag change n everything was well. Later when I went to fetch my car as I was driving home, the car cut power n was stuck. Phoned them to come help which they did n towed my car back to the dealership to get it checked. Apparently there is a wire that's earthing on the gearbox which is supprising cause none of this was happening before I took it in. Today again I fetched it and it fine. During lunch it did the same thing, now when I report it to them they tell me I need book it in for rewiring which they will charge me. What a whole wow n nonsense.