Appalling service from MTN

I have a contract with MTN, it was due for an upgrade in November. I then got a call to upgrade it and was offered a deal which includes data and minutes. I was hesitant to sign up for it but they kept on calling and eventually I signed up. They advised that I would get prorata of the deal but only got the data. I called their call centre I spoke to a lady who placed me on hold to find out and came back confirming that I’d receive the data and minutes the following month. 12th of the November came and no minute as promised. I called back and spoke to a very rude boy by the name of Thema/Themba. He was very unhelpful and very rude and when I asked to speak to his manager he refused and ended up releasing the line after putting me on mute for long. I called back and spoke to a lady who said their managers are all in a meeting and they are unsupervised. She said Drew would call me back in 30 minutes. I’ve still not received their call till now and that was last month.