i purchased iphone 17pro

Hello, I was on a live chat where I was advised to check out the iPhone 17 pro, to add promo code for £0 upfront cost and I was getting the 10G data overrides once I made the purchase and provided my order number. Once I ordered and went back onto the chat the agent was gone. I am looking t get this sorted ASAP and I need the unlimited data asap it was what was agreed upon. Thanks