The only person or company that can come out of this with any credit is the OP, they have driven this from the beginning to the end.
Both MJ Quinn (Openreach subcontractor) and Aquiss simply haven't done enough on this occasion, Openreach can rightly be accused of causing the initial issue with the infrastructure confusion but to be fair to them they have been the ones to send out their directly employed workforce to get that resolved.
Rather than patting any of the companies on the back which would be mind boggling I think the OP is the one the ISP should be thanking with something off their first months bill.
I think with all due respect you have made it quite clear on your views about the ISP I have chosen, I had no qualms about contacting OR as I realised from talking to Martin it made the most sense, and clearly it worked.
Would your ISP have jumped through hoops to get you set up?
I'm with you @CJT. For the record, whatever works. Just works. Simples.
Whether you are emailing, calling chasing your ISP or Openreach is purely just semantics. Unless you're a die hard "one throat to choke".....but why? Results is what matters.
You could in theory send 10 emails / calls / chasers to your ISP and get.....the square root of [censored] all squared. Been there done that. Got the T-Shirt, Shorts and flip-flops.
Or you could send half the number of emails / calls / chasers - half to your ISP and half to Openreach. Perhaps this gets a result. Like mmmmm let me see. Exactly what happened here. You were put in touch with the executive complaints handling team and they did their job.
What's the net difference if you call one party or two - other than getting a result - I really struggle to see any.
Can we put this thread out of its misery and stop the stupid point scoring nonsense please. It's all done. The OP is happy and that is all that bloody well matters.