I'm taken an advantage of

I have two parcels that Fedex is supposed to deliver to me from China. its been two months of calling and speaking to different people that dont even know whats going on themselves. And yesterday i receive an invoice of a ridiculous amount to pay for miss-declaration. at my desperation i paid, no response or confirmation from them an today i receive another invoice for another ridiculous amount to pay. what is going on there? please help