BAD CUSTOMER SERVICE

I am very disappointed and angry with the service I got from MTN ,I bought airtime on Saturday at around 20h57 for R100 via my banking app ,tried to buy data using that airtime but they had a network problem, I was advised to try again in the 15 minutes, when I tried again my request couldn't go thru coz my balance was 0.00 to my surprise the l just recharged now ..called the call centre same day around 11hpm got thru to Paulina she said my airtime will be refunded..sunday morning still nothing from MTN ,I decided to call and I spoke to Sipho or Mpho not really sure about the name we spoke for about almost an hour saying his supervisor said he doesn't see that I bought airtime around that time, and requested I send my bank statement which I did but the email came back undelivered..I tried to speak to them via Twitter and their response was "we apologise for the inconvenience pls DM us ur number " and I did ...even now I'm still waiting to be assisted, I AM VERY ANGRY AND ****ED..I WANT MY AIRTIME BACK ASAP