Costco Executive Business Member

I had been long time Costco Executive Business member, but for last three years, Costco’s 2% check never comes on time. Every time you call they give you run about on it. For the last 6 weeks I have been calling them, but no response. Went to the Costco Store and informed member services, manager on duty NO response. Bottomline, rebate check for 2% is still missing? They have no response, or remedy and expect customers to keep calling them. This is going for atleast for last three years, every year keep calling for check.