Here's the dilemma - my credit card company has messed up. Basically, as I don't recieve paper statements any more, I have been a bit lazy in checking my account carefully and have just noticced that they have failed to charge me interest on my balance for - well, it appears forever (we are talking over several years potentially) - as far back as the online records show.
I am guessing that at some point I had a 0% deal on the card which they have failed to terminate.
Where do I stand with this? I could feasibly be charged a huge amount in back dated interest, which would obviously not be a good thing.
What should I do - come clean? pay the balance and cancel the card and hope they don't notice?

