If you do decide to continue bringing this to the attention of the Minister of Parliament's office, amaranth, you might want to invoke that term....."procedural fairness," which despite being pretty broad and subjective, does include things such as "communicating adequately and accurately with applicants" and "processing without undue delay" (in CIC's own words). That one about "receiving fair and equitable treatment" as other applicants might apply too, since it was not only your right to pay using a bank but it was also highly unfeasible for you to pay through the alternative route due to not having the credit card.