just get new axles. once they have been torn for a while and the grease comes out and water and dirt get in theyre kinda fucked, especially if they are already making noise. even if u wanted to get them fixed it would probably cost more than new ones if u took it somewhere bc theyre are goign to have to take them out, rebuild them, and put them back in(although this may not be the case for ur audi axles bc theyre probably expensive) and a lot of shops dont even rebuild axles anymore.