Keep the original notice, envelope or email, tenancy agreement, rent records and all messages with your landlord, and make a dated timeline of events. Check whether the notice includes the required details, gives the correct notice period and states a legally permitted reason where one is required. Evidence that a notice followed shortly after you made a complaint or used a tenancy right may help support an argument that it was retaliatory, but the facts of the individual tenancy matter. You can bring the issue to the RTB for dispute resolution, or seek advice from Threshold or a solicitor; the RTB ultimately decides the dispute.