Your address is KCI2 Assure, so a two stage install ( preparatory work done in advance on stage one ) and OH ( overhead feed ) via a joint user pole , so a ‘power’ pole ( one belonging to the power company , the DNO distribution network operator ) used to deliver the overhead ‘wire’ to your property.
There are understandably strict safety and usage rules about poles that belong to the DNO , they are primarily to distribute the electricity supply, a secondary use is that Openreach can also obtain a licence to attach their own cables to them , the separation between power and telecom etc need to be observed, in these circumstances, it can only really be a guess to what the issue may be , but OR cannot just provide a new CBT on a power pole , even if it’s got a copper pair DP on it , permission is needed for the new equipment before it can be fitted to a DNO pole .
I would imagine because your FTTP service is dependent on a third party ( the DNO ) if ( for example ) they have their own plans regarding that DNO pole , they could refuse any further attachments and the order then cannot proceed , perhaps in this circumstance , the Openreach policy may be to cancel the order before the second visit ( the second visit is the contractual date ) , so as you say , perhaps to remove the penalty for late delivery, by cancelling the ISP order before the contractual date arrives.
You have a reasonable argument that you ordered in good faith , but the counter argument is that if the DNO say ‘No’ , these are matters beyond Openreach’s control.
Irrespective of the issues , you should have been better advised, but that would be via your ISP , but beyond that it’s impossible for anyone on this forum to really second guess what the actual problem is , suffice to say power poles are not a very common problem overall , but in some rural locations they can be , but that is of no consolation to you, all you can do is ask BT to enquire with OR .
