I haven't been given a months complimentary.
I expect you will find, Jim that your subscription has already been removed, I checked mine and it is back to October 2015.
As I understand it, it is not the advertising that must be honoured, as that is only an invitation to buy and they don't have to accept your offer. What could be a contract though is the fact that they took the money and sent out receipts in the form of emails. However, as I said earlier, I presume that they have sought advice from their legal department before acting.