Lack of service from Cell C. Get your sh*t together!!!!!!

I have Cell C fibre and 1 Jan 2019 I moved house. Therefore having to changes ISP for the fibre. I contacted Cell C to cancel my contract SADV that was at my old house and I got a new line with Vumatel. I look at my invoice and I am still being charged for the SADV line that is at my old house. I have emails confirming cancellation. Why am I still being charged for this? I want a refund on these charges!!! When I try call Cell C support, I have to eventually put down because they do not answer. A lady from the social media dept called me an advised that my old line is still active. It should have been cancelled in Jan already. She said the fibre dept will call me. Nobody has contacted me as yet – THIS WAS 7 DAYS AGO!!!!!. Also my statement has my old address and has not been changed.