MTN South Africa Customer service exptionally poor

So I got called by MTN back in 2020 offering me a Made for Home 30GB package deal which I signed up for 24 month contract "happiness". 24 months later towards the end of my contract I got called by MTN reminding me that my contract it is due for an upgrade of which I've declined, then a month later after my contract expired I was still billed the same amount, I then called the customer care line to dispute to no success, I also went to a MTN store to enquire and I was told to call the customer care again. I then sent a mail to retentions for a cancellation and I was not assisted, 2 weeks ago I was rep**** by Dimakatso Tshabalala asking me for a ref number for my cancellation she never got back to me after. This is so frustrating as I am still paying for a service that I no longer need or use for 4 months now, my last resort is to take up legal action, I am disappointed with MTN service it is exceptionally poor