What happen is I got an offer through email from citi bank with a coupon for a free cup of coffee which can be redeem at any 7 Eleven store. I had the coupon printed and brought to the store and I was told the coupon is not good to use as they accept "Original" coupon only. A coupon offered through email can be printed out only, and it's considered as "Original". I filled up the coffee, brought to a cashier and I was told that store doesn't accept it, by a very rude clerk. I explained where and how I got the coupon from and there's no way it looks like some other coupons from magazines or newspaper. It's from email, you can print it out only, right? I told the clerk "OK, I'm fine if you don't want to accept the coupon. If that's the case, I don't want to take the deal and buy the cup of coffee." The clerk suddenly changed the face and said "Pay it or I'll call 911". I experienced real bad attitude for customer service from this 7 Eleven store.