Bad Service from Cell C customer Care

In March, I logged in a query, because for some reason my night data wasn't working. I will download stuff before 7am, only for my airtime or daily data to be used. First time, I was told that they can see it on their system, and that a refund will be made but it will take a month. I followed up after a month, only to be told that their back office, hasn’t resolved my query. I spoke to some lady and she said her team leader will call me back, and they never did. This morning (6 June) I was downloading a file before 7am, and my NIGHT DATA DIDN'T WORK AGAIN. I called this morning, and I had to hold for more that 30min. Only to be told that, they can’t see today’s record, and that I can't be refunded and they claiming that I used my night data. I lost my screenshots and I can't really can’t proof anything right now. I've asked to listen to telephonic records, since they did say they could see there is a problem, and that I will be refunded. I need access to my telephone recording so I can escalate this.