I can't transfer bitcoins from Copay to Satoshitango (arg)

[hasan21413]

Hi!

Yesterday I succesfully transferred 40US$ in bitcoins from my bitcoin wallet to my satoshitango account (an argentinian website that manages cryptocurrencies), but then I tried to transfer 600US$ and I couldn't, the operation got stuck, after 4 hs it still was in "sending" mode. I made several attempts, hoping it was just an error, with the same results over and over again, what's going on? I really need to sell my bitcoins!
Thanx,

G.