Airline Charges

I was recently charged for changing flight dates. A charge for this service was to be taken from my Vusa account. We are changing to a new credit card and I suspect that the new vharges from AIr Canada will be rejected as the old credit card will be cancelled. No one in all of yoiur system does not know how to fix this. I guess I can wait till your charges are rejected, then maybe someone will wake uo and take notice.