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Are you sure you're not already using the piggy bank? Once I paid for the piggy bank I restarted my phone just to make sure everything's synced up. The next time you fail a level try selecting the option to continue by paying the required gold bars. If this works (it did for me) then that means it (the game) can access your piggy bank.
This is a scam you cannot advance in the game or access any features without paying or waiting tremendous amounts of town or getting nothing at all I'd suggest get one that is totally free they're out there and this game was once too until they planted the seed to get you coming back then they put cost on everything and charge you whatever they think you will pay. Go on to the next free game they've made so you will not have to pay!
Reading through the link you're still not answering the question but reading between the line it looks like you'll need to pay **EVERYTIME** you wanna "use" your piggy bank. I've paid once for a piggy bank as it tells me I cannot use the 100 Gold Bar without first purchasing a Piggy Bank and I've use some (not all) of the Gold Bars. Yet I don't see new Gold Bars being added to this Piggy Bank (the one I brought) which infer that user *MUST BUY A PIGGY BANK EACH TIME*?
Still very confused.