Enchanting Gothic Quarter by Night

I am confused. I have received email confirmation on my booking. I arrived at the meeting point 10mins before 6.30pm (in front of Hard Rock Cafe at Pl Catalunya) but see no one with green umbrella. I asked a lady sitting at the cafe stairs in case she’s part of the tour group, but she is not. I have messaged Paolo, the tour organiser, twice informing about my arrival and another text to ask if this is still happening. And I never got a reply. I waited until 6.44pm or something, and decided to left replan my night. I could have booked another tour :( Paolo, if you had emergency or unforeseen circumstances, that would be understandable, but if it’s otherwise, an advanced notice on cancellation is expected.