My co-director was the subject of a fairly substantial credit card fraud, in fact it was featured on a UK television programme.

One of the things that came out was how their computers monitor untypical usage, leading on from which, which they don't seem to publicise, if you tell them when and where you are going on holiday/business, it can take account of that in monitoring.

I can't say whether that would have helped you, but it might have done.