I wonder about commission of cheque

[sswss]

I used to live in Canada by working holiday visa last year and now I'm living in my country. So I received a cheque about tax refund and then handled it to the bank in my country. 

But money was not fully sent to my accout, 5 dollars were not sent to my account. And before I handled the cheque to the bank in my country, I already paid commission to them.

So I called to the bank in my country, they told me maybe CRA sent money to the bank in Canada and then that bank sent money to their bank and then the bank in my country sent me that money, when the bank in Canada sent money to the bank in my country, 5 dollars were charged as commission. 

I called to CRA to ask about these details, but reprensentatives in there just cutted me off, talked shop and then hung up the phone by themself. 

So I came to here. Does anyone know if the details that the bank representative in my country told me is right?

[sswss]

sorry but don't know how to delete this