After you file

They should refund the monies. Not have me write to them after 4 months and dispute the CP12.  My advocate told them about this and they still sent out the CP12. What the heck? Why are they not following the LAW.  I filed 1/31 sent 8962 on 3/6/21 did not get my refund (partial) until 6/16.   What I have to wait for them to fix it.. That is not the letter says they say I have to write to dispute. What is their problem.?    They should have fixed this they had 4 months to correctly process my return.  I have waited enough!!! How inept???