Telkom are useless

I work for an NPO - The People's Dispensary for Sick Animals (SA). In 2013 we moved our Joburg branch admin office out to Soweto, next to the hospital. For a few months now I have been trying to get Telkom just to change the postal address but because we only have an NPO number and not a CK number, nobody at Telkom seems to know how to change the address. We have 3 accounts. One consultant was very helpful in sending me all the statements I had not received and told me I would have to take my NPO Certificate into Telkom Direct to have it uploaded to have the address changed. I eventually got to Telkom Direct, but when I got to the desk after waiting 20 minutes in a queue I was told they cannot do that. The Supervisor could not help either. Gave me same number to phone again. Phoned, nobody could help, transferred me to another consultant only to have the phone conversation cut short when the consultant just disappeared while I was talking to her. I am at my wits end. Don't know how to remedy this. I Hope somebody at Hello Peter has some ideas.