Telkom is the gift that keeps on giving

I went to Telkom Menlyn twice last year to change my boss's email address on their records. I handed in authorization letters and asked the person assisting me both times, to make sure the address is changed on the system. Both times I was assured that it would be changed. Telkom keeps on cutting off the line without us receiving any invoices so today I phoned client services and was told the email was not changed and they can't change it except if my boss calls. This after how many authorization letters. This is utter pathetic service and just shows that the administration system is clearly not up to standard. I am advising my boss of terminating the service with Telkom