Welcome to the Bunnings Workshop community @Werkshop1. It's great to have you join us and many thanks for your question.
It's would be beneficial in giving some great advice if we could have a little bit more information about your pergola. Some pictures would be helpful also. What type of roofing is on the pergola, can you tell where exactly the leaks are coming from and were the appropriate roofing screws with gaskets used to fix the roof sheeting down?
We look forward to hearing more about you leaking pergola issue and can't wait to assist you with some solutions.