Mrs Buxton was using her mobile phone to look for tickets on Ticketmaster on 2 September, when a link to Gigsberg popped up advertising the same event.
She said: "I’ve been on Ticketmaster for years, we’ve been to see the likes of Adele – I’m not stupid.
"I clicked on the Gigsberg page and I ordered two tickets and gave my bank details.
If that’s not stupid, I’m a fucking genius.