Is your credit card interest rate 18% or
 higher? Call the number on the back of your card, tell them you have 
seen lower rates and chances are that you can get them to lower it.
Your best leverage during the call could
 be if you have a recent offer in the mail with a low introductory rate 
of 0%-5%. If you don’t have a recent offer, you could mention that you 
are considering the No-Fee Scotiabank Value VISA Card for 14.99%, the 
lowest rate I found with no annual fee.
If you have been paying your minimum 
payment on time and they consider you a good customer, they will likely 
be willing to work with you to negotiate a lower rate. If you are told 
that there is nothing they can do, politely ask to speak to a supervisor
 as they may be able to make the change.
source: canadianfinanceblog.com