A6 fuel cap problem

[S2thet]

Hey guys i recently purchased a 2012 s line a6. I tried to open fuel cap a few fays ago and it wouldnt open i managed to pop it open amd fuelled up. Everything was fine for a few weeks but now the same has happened again. Ive managed to open it again and the mechanism is working where i push the spring oowered bar in and it closes and when i push again it opens but when i push the fuel cap onto the bar nothing happens. When i lock the car it stays closed but when i open car it flings back open. Ive searched youtube and forums and its a common problem but i cant find a solution. Any help is massively appreciated. Thanks alot

[James]

I'm assuming you don't have a warranty as you've recently purchased it?