I use Pro account for more than a year. Paid for it on the 30th of September in 2014 by Google Play using my phone. It has worked good for a year.
3 weeks ago, on September 30 of 2015, there was an automatic payment from my bank account, saying "GOOGLE *Snoworange". I've realized just now that I don't have Pro account by now.
Disappointed...
Attached a screenshot of payment.