Costco Tire Center at Mt Prospect Illinois Replace wrong tire and refuse to fix Mount Prospect

I went to the tire center and had my two front tires replaced. They supposed to rotate my rear tires to the front and put new tires on the rear. After the service, I just checked the left front tire was one of my original rear tire that was rotated to the front.  After a while，I noticed by chance that my current front right tire is still my original front right tire.  I realize that they did not change this tire.  I went to the center to complain about that, however, they did not admit, just saying that We did the service and you drove the car away.  The service is finished.  If you found this before you leave or come back in one day, we would change the tire back.  They just don't want to do anything about that.  Although the service was done a month ago, the two front tires should be similar.  Now my front tires are so different, they just refuse to acknowledge that. I called the Costco corporation and was given a number to call.  But I noticed that the number is the center's service number， I am so disappointed and fell despair.