Retirement tax questions

The receiving institution rolled both the after tax contributions and earnings into a Roth IRA instead of just the contributions.  The sending institution issued a 1099-R with the full amount of the distribution, zero taxable, and a code G.  After- tax contributions were listed in box 5 of the 1099-R.  Receiving institution has said there is nothing they can do as you mention above, and client has agreed to pay tax on the amount of after tax earnings accidentally put into a Roth.  How can I report this to show the earnings as taxable?  It doesn't seem like I can get any 1099-R or other paperwork from the receiving institution that made the mistake.  Any suggestions?