in making the application, the landlord was motivated wholly or partly by the exercise or proposed exercise by the tenant of any right, power, authority, or remedy conferred on the tenant by the tenancy agreement or by this or any other Act or any complaint by the tenant against the landlord relating to the tenancy (unless the Tribunal is satisfied that the purported exercise or the complaint was or would be vexatious or frivolous to such an extent that the landlord was justified in making the application).