Billing department offline

I am very disappointed I Siphindile Khulusi who was very happy to tell me their systems are down at billing and she is unable to assist me and she can't even take my details to call me back when she was back online, however I managed to peak to Musima from cancelation who politely helped and told me to bear with her as the systems are very slow. I need to understand that if Musima can be so patient and assist me so passionately and Sphindile could not even care.

I need my billing to be amended as I canceled the month to month 40g data in February and I don't have any data allocated to me yet I have been billed R159 on my statement. Can I please get someone to help me with my query as the debit order is coming off on the 20th March.