Ben Howard in new Plymouth show after tickets fiasco
Singer Ben Howard has arranged an extra show at Plymouth Pavilions after 750 fans were told their tickets were invalid.
Nottingham-based Seetickets oversold the tickets for the show on Saturday night.
Devon-based Howard said he was "gutted" and announced another show in Plymouth on 13 November.
Those who bought tickets directly from the Pavilions or through Ticketmaster are not affected.
A spokesperson for Mercury Prize-nominated Howard told Seetickets customers who lost out: "We're offering all 750 of you free tickets for this show, hope you can make it and hope that slightly makes up for the hellish last 24 hours."
Seetickets said in an email to customers: "Due to an administration error the show was oversold" and advised people to contact its customer service number, 01159129000, for refunds.
Many fans earlier voiced their disappointment on Twitter.
April Wilmott, 25, who travelled with her boyfriend from Bristol to Plymouth on Friday for the gig, said she got an email at 21:30 BST on Friday telling her that her tickets were invalid.
"They seem to have massively oversold," she said.
"I'm absolutely heartbroken. I've been wanting to see him for ages.
"It's been absolutely awful."
Susie Dabson, who bought tickets for her two daughters, said: "They are so upset, they've been looking forward to this all year."
Robert Maltby of the Pavilions said that Seetickets customers who had been told that their tickets were valid should go to the Plymouth Pavilions box office after it opens at 18:00 GMT to enable their tickets to be re-issued.
He said: "All fans that missed out by this unfortunate error will be issued full refunds and given free tickets to the new date on the 13th.
"See will be in touch with you very soon to explain the process moving forward".
Howard's debut album Every Kingdom, which has sold more than 200,000 copies in the UK, was nominated for the Mercury Prize.
Howard, who studied journalism at University College, Falmouth, used the Pavilions to rehearse for the sold out UK tour.
Seetickets was unavailable for comment.