Double charged and no accountability or assistance

I have been trying to sort out a billing issue whereby I am being double billed for my fibre. I have about 9 accounts with Vodacom (cellphones, routers and fibre) I relocated my fibre on the 30th June. At the end of July the debit order went off as per normal with the normal amount (not short). Now I look at my invoice for august and I am being billed for July fibre again, claiming my fibre was not paid at the end of July, which is incorrect. When I call I am taken from pillar to post. I pay over R6k a month to Vodacom and have never missed a single payment, but now I am being overcharged and nobody is taking accountability. Your fibre department say I must speak to the other department, I cannot get through there and your agent was very rude and annoyed with my wife and I's questions. This is very disappointing as all we did was relocate the fibre, your guys came to do it, and now the bill is a mess. Also after relocating and being connected in the new home the new tenant in the old home said she cant connect hers as seemingly ours was still connected there at the old house. How can this be? And is this not the reason we are being charged double??? Fix this mess please!! I refuse to pay something I do not owe, vodacom please fix this before the debit order goes off!! The service I'm receiving is appalling!!!