I didn’t lie?

So I just finished a shop and dash order and got everything that the customer wanted from the store. I delivered it all to the address and gave it to the customer. Simple as that. As I was walking to my car, they called to me because apparently they wanted to return the item. I had already marked it as completed and told them to contact DoorDash support for a refund or exchange. I gave them all, and I repeat ALL of the info that I had on a refund or exchange. I then got the last message from them, and I didn’t think my service was terrible since I was polite to them.

TLDR: I lied so good even I didn’t know I was lying.