*****ing money after cancelling

Black Friday in 2017 I took a Data Package from MTN for R499 for 60Gb day and 40Gb night data and the following 3 months MTN kept on giving me 20Gb less day and for those 3 months I had to kept on calling them and ask them to fix it even had a review about it on HelloPeter and after 3 months they finally got my data package right, . In November 2019 the contract was about to expire and MTN again MTN gave me 20Gb less day data and I wrote to them stating to stop bothering me with upgrade messages since now I see they can't get contracts right and I will be cancelling it when it expires.

Thus I used that last data and in December 2019 I called MTN to cancel and I explained why I don't want to cancel and the person who helped me asked why I don't just take a 40Gb day and 40Gb night package from MTN then which I said no and I was told my contract will be cancelled. 2 weeks ago I check sim card and no data is on it so I was happy since now I am done with MTN contracts but in January 2019 I was debited R538.21 from MTN and don't get anything from MTN.

I want this fixed MTN. I want my money back ASAP and please don't even try saying you will give me the data since I already gotten Fixed LTE last month so got enough data. I want my money back now and not at the end of the month. I want it back within this week. How do you think people will take contracts again in future if you try stuff like this. I will rather stay pre-paid then than get any MTN contract ever again.