Insolent, inefficient call centre agents

I ordered a tablet on February 21st from agent Zunguzette. Seeing as I had an old deactivated account they approved me telephonically and had the device sent with ram. After receiving no device for longer than promised I called to update only to be told they had been trying to contact me via the deactivated number. 4 separate attempts to update the contract details later and the device is returned to sender, I am BEYOND furious! I called in and spoke to Luyanda(?) who said if I update to the correct contact details I would be flagged for *****??? He had the most aggravated attitude, demeaning me as a customer and speaking to me with such insolence my colleagues were shaking their heads in disbelief . He was supposed to contact a manager, when I asked if he did so he cut the line! I used to work for vodacom. I was trained better than the service I received with this order, so bitterly disappointed