Originally posted by: Sphexi
Originally posted by: SoulAssassin
Gym memberships, magazine subscriptions and a few other contractual type things are special cases. They will go through no matter what. It's basically done to protect the merchant, say you sign up for a gym membership that bills monthly and then decide you don't want it. They won't let you out of the contract so you decide to close the account. If this prevented the charges from going through then you just violated the terms of your contract with them (I know this isn't exactly the case of what happened to OP). In this case, while your account number may have changed it is still effectively the same account in Chase's system and there is a database link from the old to the new account number. Several banks tie the type of account it is (eg platinum, gold, points, etc) to the IIN which is the first 6 digits of the account number. I can't speak for Chase directly but it's probable that they do the same thing so to change your account type they had to change your account number.
/has worked in the cc industry for 10+ years
It's called recurring billing. When they submit the transaction to their processor they flag it as "recurring", which gets to the bank, and usually is processed even if the card is expired or wrong. Because that card number is forever associated with your account (they don't reuse them yet), they'll still let the charges go through.
You still want to update your info with your gym though, eventually Chase may refuse the charges from them.
/has worked in the online cc industry for 1+ year?