Still waiting for cancellation and still being billed

Good day,

I cancelled my telkom landline online on 28 May 2018 as they told me to do at the shop.I received a ref no but till today the line is not moved and I am relocating. I have contacted customer care numerous times and they keep telling me that they sent e-mail to cancellation department and someone will contact me which no one ever did. This is the second time I am struggling with telkom with cancellation of a line.I am still being billed and what happens if new people move in the house when I relocate then I will be charged for calls that I'm not making. Very unhappy with this poor service and hops i can be assisted asap!