Confirmation in tech-upgrade.

recentry i had trouble with tech upgrade that tapping on screen caused double tap registered inside the game software which caused unwanted upgrade of tech . i have sent suggenstion about add confirmation. anyway today, just now, i had same trouble again and my tech-digging is getting upgraded again, which i really do not wannted because stones are always over flown in warehouse. have sent letter to support immidiate and thir answer is that i can not cancel the upgrade. now this is very bad. i think tech-upgrade should be done same way as other upgrades.

Happens to me all the time. It won't happen if we all slow down and take a deep breath. Hope they put warnings in all sorts of things.

sorry, never helps. it was just when i touch the screen in City view, and suddenly message "Started upgrading....". so even if there was deep brease or do it slow, never help. why not just move the Upgrade button in tech to same place as all others, which is at left buttom, isnt it simple dont you think? or should i suggest to add "De-greade" option to cash back 50% of upgrading cost. or cancel upgrade with 70% cost back? Or should i suggest Apple to make touch screen to less sensitive? or add option to adjust screen sensitivity?