Issues Retrieving Contact Details from HubSpot Deal Data

Hi, I'm getting no response from support email, so thought I'd try here as a last ditch attempt. I'm trying to get all data from a Deal in Hubspot to then email the customer contact. I can connect and find the deal once in a specific stage, however, the Hubspot retrieval logic seems flawed and regardless of how I phrase the prompt, the contact details returned are those for the deal owner, not the associated contact. Please can you help/advise how I resolve this? Thanks