Bad workmanship

On 20th of December 2023, I took my vehicle for service at McCarthy Vw Arcadia major service was done, with both the water pump belt and cambelt replaced. Sunday the 5th of March 2023 started experiencing erratic idling, have the vehicle booked for repairs on the 6th for the 13th of March 2023. Their findings were a broken steel pipe on intake to turbocharger. Unfortunately the manager refuses to replaced the pipe, citing it's rusted. During a major service someone broke the pipe whilst replacing the belt for water pump and concealed it with insulation tape which of cause started loosing adhesive properties due to heat and sucked on more air and creating moisture which resulted in the rust he picked up on the steel pipe. the only hands that worked on the vehicle it's theirs, I haven't taken the vehicle anywhere for any repair whatsoever since the major service. https://youtube.com/watch?v=ZtJ8Tr5Znj0&feature=shares