Repair quote changed drastically

Job no 108666, was quoted to repair for R587.10, the quote was accepted and the 50% deposit (R350.00)paid. the payment was acknowledged and commencement indicated. Today 7 days later I received a SMS stating re-quote for Job 108666 R 2 540.07 If the initial quote was R 2 540.07 it would never have been accepted as it is an old camera that is not worth any where near that