MTN robbing me off

My mobile data and airtime has been disappearing for some time now and I've been wondering why is my data usage suddenly so high. On 10 Sep 25 I loaded R400 airtime to pay towards my XtraTime balance, I received R400 promotional airtime - that R400 promotional airtime started depleting without any calls being made. I only managed to make calls to a total duration of less than 16 minutes but the whole R400 was depleted. I also have a daily data of 2Gigs recurring for 30 days....this data is already more than 50% used by the time I wake up in the morning. I decided to phone MTN about my concerns - the first consultant that took my call goes by the name Andisiwe Ndlotyeni who blatantly told me she couldn't assist me and I must phone back after 2 hours because her system is not updated. I told her I needed to make phone calls and she couldn't care less and told me to phone back after 2 hours. I asked if she could call me when her system gets updated and she agreed but never called. Today on 11 Sep, I called MTN again and spoke to a lady who said she is Bobakhe - again I did not get any assistance from her - when I enquired where my data was going she gave me a breakdown of how "I used my data" in the early hours of the morning between 12:23am and 06:03am. I told her I was sleeping at that time and my phone was off but she kept insisting that I knew what I did with my data. She was patronising and kept making comments as if I'm stupid and wasting her time. When I enquired about the R400 airtime that disappeared last night, she said her system shows that I was on a very long call. The frustrating thing is even when I told her I only made calls to a duration of no more than 16 minutes, she kept insisting that I made a long call. I find the service of both these ladies unprofessional and disturbing - when a customer has an issue and phones the call centre, there is surely a way to deal with that, starting with empathy. I have been with MTN for over 20 years and I must say that the experience with MTN has spiralled to the pits. Their pricing has become appallingly ridiculously expensive, their staff has disturbingly unprofessional attitude (Bobakhe and Andisiwe), and they've ****** me off my money and fail to account for it. I am now considering leaving this service provider if they do not attend to me and my concerns and I will ensure to escalate this further.