I cannot withdraw money, and receive abusive calls and persistent phone calls.

I was able to withdraw the first $250, but the next $585 was declined. It has remained on hold since then. I often receive calls from a 050 phone number (different each time). They ask me to pay 25% UK tax on my account every time. When I say that I can't pay, my words fall apart. I can't bear to hear things like "Please kill yourself" so I hang up. After that, it will call several times, but if you ignore it, it will call again a few days later. Recently, I have been receiving calls without notification.