Hi everyone,
Yup, basically everything indicated here is the situation. On the SAIX side of things we have greater control in how we can cap users, which means that we handle the actual capping/disabling of accounts (and so on and so forth), while on the IS side the capping is handled by IS themselves and not us (we merely indicate what kind of account a specific user is using, not whether they are capped or not). As we do not handle capping ourselves we are charged on a "per account" basis, not a per GB basis, and as such any over usage doesn't get charged to us.
IS's capping policy at this time is lenient and they do not appear to hard cap accounts when they exceed their 30GB threshold (though this can always change, at the moment that is not the case). This is the same as with every other ISP reselling IS accounts in general (it's not only limited to the local only ones).
Are there any specific questions anyone has regarding the service?