Seriously, don't waste any more time on this. Reporting the number has absolutely no effect. It is spoofed. Tracing it would just be a complete waste of everyone's time and money. The calls can't be stopped. Most of them emanate from outside the UK anyway in jurisdictions far from the reach of law enforcement.
The can work out that you are a VM customer because the block of numbers assigned to the UK telcos are in the public domain. All they do is use an automated dialler to work through them.
The whole thing is a well-known and continuing scam. Just hang up.
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Hi asbradford, thanks for the message and sorry to hear that you are receiving these spam calls and we would not be able to block them. We would always call from our 0345 454 1111 number. The only thing we can really do her is change the number for you. Have you had a look at true call? Chris