Star Clicks — incorrect balance transaction

I have just upgraded my account via my balance. While "gold member" costs 29.95 dollars, it seems that more than this amount has been deducted from my account; in other words, before upgrading, i had 38.40 dollars in my account, yet after upgrading my balance got -21.50 dollar! Which sounds absolutely weird. It seems the amount of 59.9 dollars has been deducted instead of 29.95 dollars, for upgrading to "gold member". I have also emailed them for a week, and yet they have not responded which could imply that they are scams. 7 days of my premium account have lost with this mistake.