Two weeks on and still not resolved - Points.Com have told FC Support that they have no trace of me trying to pay for the Bonus and I should try online .... umm I can't do that as it's retrospective!
But you're right - it's the Black Amex I'm trying to use. I'm loath to use one my other (few) cards as none of them other than M&S earn any other rewards or cashback (yes - poor showing I know - but they are legacy cards from a former employer so do have other attractions
I seem to have found however a good rep at Crawley who's following this up for me each day and is actively keeping me informed and extending the hold on the Reward flights. I suspect however that given the time elapsed the CVV will have lapsed so will have to start again ..... At least if it gets sorted this week I'll get the bonus!
For anybody else with the same problem FC Support are only available between 10.00 am and 4.00 pm Monday Friday and we can't speak to them direct. Also, if the agent you're dealing with isn't aware of the problem as they say over on Flyer Talk HUACA. Out of the 11 agents I've spoken with only three were aware of the issue - make that four now my new friend believes me!