A readback preserves the clearance

A fictional classroom recording contains an addressed instruction to climb to flight level one two zero. The learner's readback instead states flight level one three zero. The controller hears this discrepancy before the aircraft acts. One observer says the readback has now amended the clearance automatically; another proposes saying ROGER and leaving the two different values unresolved. The task asks how the communication loop should be repaired. It does not supply a real route, aircraft performance or permission for any actual climb. Both values are included only to make the mismatch explicit. A complete answer distinguishes the instruction as issued from the incorrectly repeated value and explains the need for a corrected message and accurate readback, using the intended aircraft identity so another station's instruction cannot be confused with it.