You can and should sign on for credits after your JB exhausts and should call in and ask for a supervisor, explaining all the confusion, telling them you wish to ensure that you are getting credited contributions while awaiting appeal result. even if you lose appeal, keep signing for creidts as they are vital to maintain future possible benefit entitlemetns and pension rights.
There are many new staff in SW offices who haven't much knowledge of the complicated system that SW is, and are getting little training due to pressures in offices. TBH, its a mess and your patience will be needed! SW is at breaking point.