This is very normal, as the IRS can communicate in a very aggressive way. We understand and recognize that you may be anxious with your situation. However, we strongly advise you to file and become tax compliant in the US. At the very minimum, have your situation assessed. Not doing so could get you into trouble with the IRS, sooner rather than later. Not reporting your foreign financial interest and filing your taxes once you are aware of your obligation is a criminal offence under American law.
There are programs the IRS has started where you can file and if it wasn’t willfull then penalties are usually waived. The streamlined procedure is used a lot in these cases. Never take any action in entering this program without proper assistance.