That email you received is a confirmation that you have the right to change your mind about agreeing to waive the customer service guarantee (which you agreed to when you registered with TPG) within 5 working days.
If you're happy to continue with your TPG NBN order and you don't wish to change your mind about agreeing to waive the customer service guarantee, there's nothing you need to do but sit back and wait for your NBN service to be installed!
What is the Customer Service Guarantee (CSG) Waiver?
The Customer Service Guarantee entitles you to receive compensation in a number of circumstances, including for example, where there is a delay in installing the service, or repairing a fault, or where we miss appointments. We believe our services represent excellent value compared to other suppliers in the market. The CSG legislation came into being years ago and, in our opinion, is outdated in today's telecommunications landscape, and its mandated compensation makes it difficult for providers to supply the best value services. Asking our customers to agree to waive the CSG doesn't change the fact that TPG will always do our best to provide you a quality service and a great experience, resolve any issues quickly and effectively, and provide reasonable compensation for service issues. Waiving the CSG just means that the compensation TPG may opt to provide you in certain circumstances isn't mandated to us.