green dot moneypak scammed pasenda California

we were scammed  and was told by the scammers to go buy a green dot monerpak card and put 250.00 on it and then come home and give them the numbers off the back of the card, we found out it was a scam and never gave them the numbers off of the card. then the next day we went on line to green dot web site to get a refund, green dot wanted the numbers off the card so thinking this was a secure site we gave them the numbers and recieverd a e-mail stating our refund was excepted and we were to get a check in the mail in 7to10 days which we never recieved so we contected green dot and they said there was no money on the card and we would not be given a refund. they said we gave the numbers off the card to comeone else, which we never did! we ask where the money went,they didn't know,we sent all kind of e-mails to them and also called them,nothing was evere done, i think green dot is working with the scammers. i would like every on the internet to read this before they work with green dot corp. or use their secure web site? thanks calvin midland mi.