Vice President John Dramani Mahama, on Wednesday charged the National Communications Authority (NCA), to apply sanctions against telecom operators that fail to honour their licence requirements to provide quality service to the public. "Indeed failure of compliance by operators to the primary qualities of service indicators must be met with the appropriate sanctions by the NCA that will prompt them to perform to standard," he said at the inauguration of the refurbished Head Office building of Millicom Ghana Limited, operators of Tigo.