Masque's solution is valid, I.e. as this is attached to your property the answer is simple - cut the offending cable off and wrap it around the pole.
I also had the same issue and found great delight in removing this last poxy remnant of BT from my property. In fact I've recently had my soffits and gutters replaced so had the rest of their rubbish removed also and if I could get away with it, I'd do the same to all of the other BT cables that come across my land (to adjacent properties) also.
Deep joy
Si thee
