After you file

I received a letter it stated that I had to pay back the RRC that I agree I owe because I claimed it because at the time I filed I did not have it, however I did receive it after I filed so I am in agreeance with that . The letter stated if I agreed no further action required so I didn't  get concerned about it . However last week I only received a small portion of the return so I tried calling all day finally after 10 hours got through and the IRS rep could not tell me anything more. So what do I do? I have never had this happen and I don't understand what else I can do.