Thank you for putting this out there.
In Canada, we don't have TV licenses, but we do have problems with people calling claiming to be from the revenue agency and claiming that someone owes back taxes. We actually got a call once from such scammers. Fortunately, we immediately contacted the revenue agency and determined that our accounts were in good standing, as we were sure they would be. Often the scammers will request that payment be made in iTunes gift cards or other gift cards. Sadly, it's gotten so bad that many businesses now have signs posted on their gift card racks, stating that no reputable organization will EVER ask for payment in gift cards and that if you've received these requests it's a scam. The one good thing is that you can't usually use self-checkout for gift cards; they must be activated by the cashier. Cashiers are often educated about these scams specifically in order to identify people who are purchasing large quantities of gift cards, so they can warn potential victims about these scams.