CELL C cell phone contracts

I ended meaning cancelled all my cell phone and data contracts I had with Cell C in January 2023 and I followed their instructions as in the agreement I had with them for more than 10 years and it is the worst 10 years of my life with any cell phone or communication supplier I every had. Till today they are treatening my with legal action as according to their chaos in their book keeping I own them money which is of cause not true. So Cell C if you carry on with this you will find yourself in deep warm water.