Rude customer services

I have app**** for Telkom mobile data to replace my ADSL line. Natasha phoned me to check my e-mail address. We had a difference of opinion on the correct format of the e-mail address and she put the phone down in my ear. I tried to call back to finalise the delivery detail of the equipment, but I cannot reach her on the number displayed on my phone and I do not have any other contact detail for the transaction.