ESA payments stopped - told to claim JSA though surgeon says no

Hi..my son was claiming esa after an industrial injury last march. He is still having ops .... as recently as monday this week.  .He had a new elbow ladt march and cannot use his right arm, movement is restricted and he is still under the surgeon. He got a call today to say his payments have stopoed even though he has a current sick note till 19feb. He had a mefical for the esa they have deemed hjm fit for work.  He was told to apply for jsa even though the surgeon said no.he was self employed