Poor service and can't rectify their mistakes

Vodacom is using different addresses for my statement.Yesterday i called to rectify that mistake and ask that they send me nee statement or copies reglecting the correct address. They told me that it's impossible i should wsit for Semptember statement. I tried to explain the urgency and importance of changed address but still they can't help. For 20 yrs they fail to help with the mistake made by them. Very poor service.