Worst customer service

Good day I am very unhappy with service I'm receiving when calling your customer care, airtime disappeared from my sim nothing on my app on how the airtime was used phoned the customer service @ 15:58 to be told the system haven't updated my usage, I should call back after an hour, phoned back again several time and @ 20:25 I spoke to an agent who muted my call without a warning the next thing she dropped, now the worst agent I spoke to few minutes ago Tholakele call made @ 07:33 refused to get me a supervisor, I asked her something she told me no I've already told I asked to start over and repeat she no said go to the store, next thing muted me also then hanged up the call to my ear. What is the purpose for her to be on that desk if she's not willing to assist, and she was very rude, impatient and had no interest to assist me. From my knowledge if I'm going to be placed on hold or mute I need to be notified but seems like mtn customer service policy is different. Even now I haven't been assisted with my airtime usage.