Poor service from Cell C

I have been having a cell c number for over 20 years now and in between had contracts and then prepaid and contracts multiple of times. The latest was the worse since I can remember. Firstly the contract was meant to expire now in May, however early in the year the people from cell c have been trying to call me to ask to renew. I took one of the options and finalised everything and even took a phone and they confirmed they have it in stock. I then took this contract as it was going to be for my Wife for her birthday. I called then closer to the time and they said they don't have stock and I asked how come if by the time I took the phone you had stock. I then asked if you can deliver before my Wife birthday and they said no in fact it will take more than 3 weeks. I then said please cancel it. I've been asking them to cancel my contract since till now I'm on month to month and they never cancelled it. Finally today I had to be firmed and asked them to cancel. I then asked on my bill was it R800 they explain many things and also this other content subscription. I asked what is that for and no one could explain it to me but to say it's me who took them. I said I never took anything so please explain it to me and they could not explain. I asked if I can speak with the Supervisor and they said I can't I need to leave my details, and obviously know one got back to me. I am writing this because their service levels have been so bad it is not even funny, and so confused how I stay with such a poor service for so many years. The service was bad, if there was a way to even not put a star I would do that.