Please, please, can you put a confirm button on the upgrades?

I've been saving coins for a month or so, ever since you announced upgrades were coming. I have enough for only 2, so I was looking over the options trying to decide what made the most sense. And apparently I must have clicked in the wrong place by accident (I was trying to scroll over the cards to see the upgrades), because now I have an upgraded pillar that I don't even use in my deck, and 1500 less coins, which would take me months to re-earn. *sob*

zanzarino, if there is any chance of undoing that purchase, even if it means resetting my account to a previous save, I would greatly appreciate it. My game name is also asryn, and the upgraded card is a Quantum Tower. I haven't played since it happened, and I will hold off for a bit in case you are able to help but only by reverting the account. If not, I'm hoping you can at least make sure it can't happen again. Thanks!