Contract Cancellation. Useless Custermer Service

I have a data contract with Cell and this contract should have been terminated last month as it has reached the end of term. I contacted the call center on the 6th of March 2018 and spoke to Nobutle. I formally requested that this contract be cancelled and notice was duly given. I was assured that all was in order and that the contract would end on the 30th of April 2018. Meanwhile, my bill from C Cell has escalated as follows : Jan '18 R211, Feb '18 R211, Mar '18 R253 and April '18 R311 . I contacted the call center once again on the 6th of April. I was informed by Hloni that my contract will be cancelled at the end of April 2018, all good. I then inquired as to why my bill was escalating as this ****le was not in use. Hloni was not able to explain why, well she mentioned content services. I asked to speak to her supervisor or a manager (Mr Jabu as Hloni referred to him, her supervisor); after what seemed an age; Hloni came back to be stating they (Mr Jabu) was unavailable. I then requested to speak to Mr Jabu's manager, again, Hloni had to consult with someone, came back to me after some time stating that they were all unavailable. I left my details, and later that day, Mr Jabu contacted me. I must say, for a contact center supervisor, his attitude stinks; leaves a lot to be desired. I mentioned to Mr Jabu that I want to talk to his manager, Mrs Nokwaba, as he was of no assistance. Mr Jabu, could not be bothered and said fine... Mrs Nokwaba called me back that afternoon. I related my story to her, she explained, again, like Hloni before her, that the additional charges were for content services. I tried my best to keep calm at this stage and rep****, that I have not subscribed to any content services, the line is not really in use. I have Fibre at home, wifi at work, etc.... Mrs Nokwaba promised that she would direct my query through to another department who deals with content services and would personally contact me on Monday the 9th of April with a progress update. I guess I do not need to mention, I am still waiting for her call... I once again contacted the call center this morning (Wednesday the 2nd of May 2018) only to now be told that my account has been handed over to the legal department and I should contact them! I do not understand this as Cell C has a debit order on my account. I duly tried to contact the legal department, you are put on hold. I held on for an age; +10 min or so and ended the call. Please bear in mind, the call center rep was at pains to inform me that I would be charged for the call to their legal team! I am now fed up and thought to myself, well, maybe contact head office! What a joke. The number listed on their website just rings and rings. Tried a few times, just rings and the call goes unanswered. No voice mail, nothing! So now, after all this time, energy, money, effort, I am back to square one! Cell C continues to help themselves to my money, no explanations provided yet that makes any sense to me and I cannot get hold of someone to assist apart from junior call center operatives who have zero authority to make decisions...