aaisp you can have a one month commitment tho, so its one thing not been able to take a high priced isp for 2 years, its another to take it for a few months.

Also my time with AAISP suggested they are willing to push openreach harder than other isp's. They are the only isp that managed to get a BT engineer on my roof to remove possible sources of interference as well as radio interference teams who walked around the area with radio devices.

Hi
Point one
I was an SFI in the past.
Two
Ask or DEMAND a copy of the "Radius" log for your broadband connection then
THREE Tell them that you will serve for full disclosure and all their logs etc under the terms of GDPR , you are lucky that you were in contract to sky and sub contracted to Openreach over the period of last May/June 2018 therefore they cannot possibly get out in any way of full didclosure.
FOUR from what you say they have not it appears been due diligent in their investigatyions so you may have
A/. a case for compensation and all costs and losses
B/. You may also have a casae of Harassment causing alarm and distress and possibly a fear of violence should your line go down for longer periods or even for a crucial time period when and if you had an unknown 'visitor' either in the day or at night that you certanly did not invite.
A good Solicitor or my advice would be to go to a Barister who has served for more than three years who has to represent you under "direct Access"
Sorry this note is rushed but these cases anoy me as generally they are faults that can be isolated by now by patching out the route of your service to find where the fault is.
The reason as well is because you say that sky are offering you an out of the service contract, it is because their staff appear to be looking at the "Manual of 'Performance Management' and just wanting to be seen to clear "X" faults per hour or day so that they look good in the world of Performance and getting the 'clears' counts in the world of Bonusesthat is not necessesarily money but pecking stakes in the rise up the glorious ladder.
BW
Hope this helps.