I've just checked the Openreach site and can confirm that Openreach are within the targets set by OFCOM. I cannot post the heat maps without Openreach permission so you'll have to take my word for it.
The target set by OFCOM is a national one so yes, there may be delays in certain areas but as long as the 80% national target is met OFCOM will not intervene.
The FTTP team should be able to find out and tell you what the delay is.
I think you are missing the point. It matters not what ISP customers report to OFCOM, you are not their customer so have no responsibility to you in regard to broadband connections. You can thank the other ISP's for this as they lobbied for Openreach to be hived off from BT.
The only help you can get from here is to be directed to the FTTP team.
There is no other option. The mods here can't deal with FTTP issues, they will direct you to the FTTP team just as everyone else has.
They are not being unhelpful, they're explaining how Ofcom works with ISPs. Ofcom is a regulator that is reponsible for setting realistic guidelines and targets for both Openreach and ISPs to meet.