yo,
i had saved 800 coins to upgrade my gold smelter.
but when i wanted to upgrade it, it seemed my coking plant was being upgraded from lvl 3 to 4.
I don't remember pressing the upgrade button on that one, so it must have been an accident or something.
is there any way to reverse this process? i don't need a coking plant lvl 4, but i do need my gold smelter upgraded.
so this would be a waste of coins.
thanks in advance,
Ruben