If you need to request some information and VAC is not providing it, then your recourse is an ATIP request. Regardless of whether the request if formal or informal, it is vitally important that you articulate and be precise in what you are looking for.
If you need some help doing this, give us a shout.
When requesting information, it is vital that you narrow down what you are looking for. It is also a good practice to start with an informal ATIP.
In most cases, if you are at this stage, you are looking for more information from you decision.