Pimped daddy

Hi all. My footwell lights in the rear don't work.front are fine.door contacts are fine as interior lights work when u open the rear doors. .they have never worked sis nice I had the car about three months, I've checked the led by swapping with front ones and there fine. I know this is a silly thing but there really buggin me, any help would be most gratefull, ps I contacted Audi uk no help there. I've tried main dealer ,no help there . I also looked on Erwin Audi for a hour couldn't find anything there . Thanks Chris