Identity Theft?

Few years back I had to pay back to CRA (Canada Revenue Agency) about $800 bcause they said you have to since it was issued to me (i never got it) under the ontario child fund, they told me there was a diffrrent address on my file where money went. I never heard of that address. I suffer mental challenges, I did not know how to fight that, I paid them. Call it $800 loss for no reason. (I guess i didnt know a site like this where you could get suggestion). Now, my wife's credit card statements have been going to kind of same adress in ontario. My wife came to manitoba and never ever lived in ontario. Could I open my previous case of that $800 with CRA, and say hey I was not mentally ready to fight this at that time, but now I want to tell you that it was unfair to me?

And how do I protect that "ontario address" showing up on mine and my wife's credit reports and banking statemnets etc.

Please help with suggestions,

Thanks.