Question about the tax return 2017

I reported the tax return 2017 regarding the merger of REYNOLDS AMERICAN INC BY BRITISH AMERICAN TOBACCO(BTI) on 7/25/2017. I did not sell either stocks or report its capital gain.

But IRS reported all my REYNOLDS AMERICAN INC were either sold or disposed and tried to charge me extra tax of $19,415.

Can somebody suggest anything I can do?

Any CPA can help?

Please contact Stella Hwong at [phone number removed] or [phone number removed]

or [email address removed]