Frustration of Dealing with Cell C

I cancelled my month to month fibre contract with Cell C about 3 years ago. They however kept billing me even after I cancelled the contract and not paying them . I have asked Cell C countless times to send me a statement reflecting the thousands they claim I owe them and to this day I have not received a single statement nor does anyone want to take responsibility for not doing their part to cancel the contract as per my request. How does one end up owing Cell C over R4000 on a month to month contract???? I wouldn't advise anyone to get into any contract with Cell C, until you want to waste your money, get the worst signal and get frustrated.