Terrible service from Vumatel

I have requested my service provider to transfer my fibre service from one address to another. This was meant to be done with effect from 1 October 2020. Fibrestream, my service provider, has been having issues in resolving this despite having given Vumatel termination instructions at the old address for several days. At the moment the person who is living at the old address is using my fibre line and I am having to buy data, which is proving costly. If you have the choice of Vumatel or another infrastructure provider my suggestion is to use somebody else. I don't know how they were awarded the tender to supply the infrastructure if they are so bad.