Bad administration and time to resolve queries

From having to visit the hospital for 7 nights in March everything was covered BUT there is an part of assessment that has been submitted with the "wrong codes" but the docter says other medical aids pay on the submitted codes. So after an months worth of back an forth nobody seems to able to either supply the docters with the correct codes after they themselves have contacted them to sort out the matter. After asking the question are they going to pay or not there is also no answer although it should be covered.