This has been happening alot. There have been a lot of unofficial codes that have passed around the internet. Once you have entered and received points for 10 unofficial codes they delete all your points. So if you've entered codes that you've found here or on other websites, chances are that is why the points were deleted. Many people have emailed disney and had their points restored, but apparantly it does not always work.
There are two different things happening.
In the past, if you entered too many bad codes, your account would be locked for 24 hours.
They have been redoing their website. They have also been streamlining the accounts...some people have somehow made more than one account, OR they are still wanting to sign in with their email address instead of username.
Old, official, real, codes have been posted online. However, if you enter one you've already done before, it counts as a "bad" code.
So you combine ALL of this, and you end up with what seems to be happening. They have started a facebook page, and people there are explaining the username/email address login problem...I believe they want us all to go to username instead of email. So if you're signing in with your email address, you have to switch that.
I think their system is really confused with the locked accounts, b/c people have said that they entered good, not-yet-used-by-them, codes, and had their accounts locked.
To people doing all these things at the same time, from what I've been reading, it can *appear* as though you enter old codes (none of them are bad, just from before) and then your account is locked and drained...but I think it's just the convergence of all the changes happening all at once.
Their phone number is posted all over the place...give 'em a chance to help you!