Faulty staff or faulty system

Whenever i load airtime to make an international call or to convert to data for the Mo'nice data deals, i experience problems. My phone shows i have sufficient balance but Telkoms system says i have insufficient balance. When i dial *188#it also shows the correct balance but then when i speak to Telkom call centre staff, they say they cant help bcos their system also shows i have insufficient balance. I have to wait sometimes for a few days before the correct balance reflects on Telkoms system . Its been like this for over a year. Telkom does not want to fix this