They do not actually "add" a day to your subscription. It's more of an delay of your current subscriptions billing cycle. That means, the mog station account won't display it but the emails you're getting as reminder, should reflect the extra day. Example if your renewal would be June 1st, your account is going to be billed June 2nd, when being on months to month basis. The same will happen to the reoccuring and long term subscribers, example if you sub'd for 3+ months instead of paying month to month. At the end of that cycle you should be charged a day later then regular. It's just like regular bills in life, you always get charged for the month prior, not the actual current or upcoming. Therefore I wouldn't be surprised if we would see that payment delay in June instead of now May, since the relocation was in the middle of may.

Here's what I would suggest, keep an eye on your bank statements and credit card charges for the month of May as well as June (if you pay month to month), if you're paying with crysta or game cards, be pro active and make the necessary arrangements, treating it as you would on a regular billing cycle. If by the end of June you are not seeing a different one time billing date, that's delayed by 1 day, file a ticket and let them know and have them look into that. The forums won't be able to look into any issues with billing, nor will be very helpful finding solutions, besides pointing out the obvious.