ADVL Inc. is how Ashley Madison bills your credit card. What it means is that your spouse/significant other is cheating on you. Sorry to break the bad news.
BTW- There are 3 introductory prices that are offered $49 for 100 credits, $150 for 500 credits and the affair guarantee price for $250. Credits are used to make contact with other users. For example it costs 5 credits to make contact with a new person, but no credits to keep contact going. It costs 30 credits to chat with them live through Ashely Madison and then there are gifts, etc. that can be given.