I was surprise one of my friend neighbour who used to work for Openreach engineer in the past but he retired now. He say all ex bt engineer can reset DLM at the fibre cabinet with one off of £40 charge and don't need isp to be involved.
He say many ISPs are being told not to request DLM request because if this happen, million of customers will ask the ISPs and request DLM reset will overload on the engineers workload.
He say if I want my line as the Fibre DLM reset, he will do it for me for one off £40 if PN refused to do it. So, I am not sure if it was allow and legal?
[Moderator edited to remove the link. The advertisement of a third party web-site is not appropriate.]