UNABLE TO FOLLOW BASIC INSTRUCTIONS

I phoned last month to change the details on my invoice. I told the agent that the information had to be correct because the invoice will be used for FICA and SARS and I meticulously went through every word. It was confirmed that the details were amended and that I would receive an amended invoice in the next billing cycle. The next billing cycle arrived and the details are still incorrect. I am so disgusted at the incompetence I am going to cancel my contract and move to another provider. The fact that the call centre agent asked me today if I wanted to change the details again and wait another billing cycle, is actually a joke knowing that I needed the details to be corrected urgently.