This is probably off the subject of costco or sams savings you money but I know that one year I was living in another state and had gotten a costco membership and had it for several months without really purchasing anything I called and explained this to them since a friend told me that she had spoken with them to about the problem but they refunded my entire membership fees.
When I went to do this she explained they will always refund the fees for customer satisfaction. maybe you can find out if they still do this.
I know sams club has once in a while mail flyers that you can get a one day pass and just pay 10% above for items purchased than. I dont have a costco in the state im in now so dont know if they have the same thing.