So to continue the story. The 10% discount check never appeared. Eventually I called IKEA and after waiting 55 minutes spoke to someone, who then transferred me to hold for another 12 minutes to speak to someone else who then said he would get the check issued. It finally appeared by email, saying that the check had to be used within a 5 day window, 3 days of which had already elapsed. I went online and tried to buy something, entered the number of the check and the validation code. The website said that the code did not exist in their database. Tried to call and selected the option to buy something. Recorded message saying "Your call is very important to us". Then "Goodbye". Tried the Spanish option. I got the same message in English. Tried various other options, all of which just cut me off for no apparent reason.