Contract Breach from Cell C

My first experience is when i had my contract expiring on the 19 December 2018, and i called in November to confirm the cancellation. I then called again in December to finalize it, the consultant told me that i am going to pay for only the benefits in January but December i have to pay the full R297. I agreed because then January i wont be pay for the Device and only the benefits( Data, minutes etc. ). I woke up today to see that they debited R297. This is in breach of contract and i am going to make sure to follow up this with my legal attorneys because i am not paying the device anymore, i held my end end of the stick for 2 years and paid this company every month without fail and they come and do this to an honest tax paying citizen, taking their hard earned money.