Air Bag Not Deploy problems of the 2011 Nissan Pathfinder

After stopping at stop sign and turning. The airbag indicator light started flashing. Took it to the dearlership it was bought from. They "repaired" the problem. After traveling less than 2 miles from dealerships,the light started back flashing. I returned to dealership. They wanted to know if I had wrecked the vehicle. I have not. After 2 hrs, they said I would have to replace the spiral cable and it was not covered by the extended warranty. It would be close to 600 dollars. I was also told that if an accident were to occur, my airbags would not deploy. I feel this is a safety issue that should be addressed. That is like telling someone the seatbelt in their car will not work. Not everyone has that kind of money to spend these days.