The SM works for the OC and if he refuses a valid request of the EC or OC he is in breach of his contract and so you are entitled to terminate his contract and pass the running of the Strata to a different SM.
As to the NTC the EC can issue it (the secretary) once a motion to do so has been passed by the EC (this is a requirement before the SM can issue a NTC unless he has been previously authorized to do so buy a motion of the EC or OC).
All the powers that a SM has is also available to the EC and OC if they wish to use it.