The SIM CARDS DID NOT WORK!

We were reassured by this company before we bought the cards in the USA that they were compatible with our cell phones. I got information for shutting off our phones at the airport as we were leaving the country, which I did successfully. When I tried to activate the SIM cards from ONE SIM CARD in Europe they DID NOT WORK. Their product information said to watch videos to learn how to load them. I was in Europe with no PC on which to watch videos. I asked for assistance and got none. My techie nephew was unable to make them work. I wasted $86 on SIM CARDS I could not use on our European trip. Because we were gone one month we were not able to connect to ONE SIM CARD untill we returned home, and were then told we were out of the policy time span for any refunds. I felt his very unfair and will not recommend anyone to buy from this company. All I got was "I'm sorry you feel this way!" How was I supposed to feel when I bought something in good faith that did not work and I was then without a phone when one would have been very helpful in many instances in Europe?
I will not do business with ONESIMCARD again. Totally disappointed in their product and service.