Absolutely awful service. I am a United Kingdom resident who is owed a refund by the IRS for tax paid on stock. Over 3 years there have been multiple letters exchanged (I tried calling but couldn't get through, or on another occasion they would not speak to me without a USA social security number - I'm a UK tax payer so don't have one!!). The letters they sent have been meaningless and have not answered the questions or addressed the information I sent to them. I will not give up as I am owed money, and will publicise this more if I don't get resolution very soon