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I am sorry to hear this.
Your landlord must protect your right to peaceful enjoyment of your home. And this neighbour is depriving you of this right. The landlord must take steps to evict the tenant.
You can bring an application to the Residential Tenancy Dispute Resolution Service (RTDRS). Here is a link to the information you will need:
You can get an order to compel the landlord to evict the tenant and for an order for a rent abatement.