Question ( Parol evidence/Collateral contract)

As owner of an office suite in Sydney you signed a commercial lease in favour of VG (lessee) for a period of 5 years. The lease contained full particulars of rent and outgoings together with the usual standard commercial lease terms and conditions. In addition, you inserted the following term on the last page of the lease:

Clause 48: This document contains the entire agreement between the parties about the subject matter and any previous statements or agreements (whether verbal or written) relating to this matter are suspended/displaced by this document and shall have no further legal effect or otherwise.

VG now argues that you made certain verbal promises during negotiations and before she signed the lease that were not included in the lease. What is your legal position?