AFAIK, replacement was the solution and genuine VW parts, was the source for the parts. This may change; as the aftermarket starts reproducing parts but from my recollection, vw maybe the only source for now. A quick google search; indicates, the lock cylinder and the switch being reproduced but not the barrel/lock
STANDARD MOTOR PRODUCTS US465L ignition key tumbler/reader coil assembly
STANDARD MOTOR PRODUCTS US398 ignition switch
STANDARD MOTOR PRODUCTS US465L ignition key tumbler/reader coil assembly
STANDARD MOTOR PRODUCTS US398 ignition switch