Customer details changed by system and call center cant help!

I recently required a proof of residence document. After being a loyal customer for nearly 12 years, Foshini has made a typo of my address. My address has never changed, how does my address magically change overnight? Phoned the call center twice and was sadly told I have to wait a month, for a new statement to be generated. A month!!! The other option was to send me a letter showing my balance and credit available with the correct address. Guess what, they still got it wrong. PLEASE HIRE PEOPLE WHO ARE COMPETENT!!! Afterwards I discover, details can be changed in store, but waiting period of a month still applies... How does this help me? This is not the first time something like this has happened! Be prepared to to deal with little or no service delivery.