CVRPLAN is Currys/PC World label. The 10 digit number is likely to be the cover plan number.
You might want to have a read of the Direct Debit Guarantee before you call them. See here: Direct Debit Guarantee
The comments I post are my personal opinion. While I try to check everything is correct before posting, I can and do make mistakes, so always try to check official information sources before relying on my posts.
I have been getting this too, but I have Not got anything from curry's or PC world.
Have you looked to see when it was setup? Thought back to then about anything you may have bought? The Currys Group have operated under large numbers of brands especially around mobile phones, depending how long ago you've been paying it.
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Have you bought an appliance (possibly from Curry's) with a cover plan?
You might want to have a read of the Direct Debit Guarantee before you call them. See here: Direct Debit Guarantee