Green stamp “Very good” does not work

Ordered this set for my classroom. Had all the things I wanted. Unfortunately, the green stamp was not working. Put in for a refund/replacement. Received a very prompt reply that offered a replacement as well as a refund. Received the second set and the green stamp still did not work. Two emails and months later, still no reply and got charged for the second set of stamps. :( Will not purchase from this company again.

###

