I created a new coupon to use for a three day sale. I have not used this particular name for a coupon before. I created the coupon so that it could be used only once by each customer. However, many are complaining that they have only put the code in once in the coupon box and it tells them that they have already used it---and they have not. (I even tried to up it to 3 uses per customer..did not help).

This is the third sale that I have had this problem. The weird thing is that it works fine for some people and does not work for others. Very frustrating for both me and my customers. What is going on??

Also, why in the world will zen cart not allow you to totally delete past coupons? It makes them inactive, yes. But I have lots of little surprise sales and such and have over three pages of inactive coupons sitting there.....never to be used again. Why??

I really need some help with this coupon code not working. Any suggestions?
thanks!