By City A.M. Reporter Viagogo defended reselling Oasis tickets for thousands of pounds on its website following the Britpop group warning fans that passes would be “cancelled” if not sold on an official site. As the Manchester rockers’ shows went on general sale at 9am on Saturday, they told their followers that Ticketmaster and Twickets should only be used for resales, and they should only be bought at “face value”. On X, Oasis also wrote: “Tickets appearing on other secondary ticketing sites are either counterfeit or will be cancelled by the promoters.” A similar post by the band had also be…