I submitted my son's tax return 8/7/2015. Changed his banking details as well. On his ITA34 was a due date 01/08/2015 (he is due a refund of aprox R 2800. 00) They have not asked for verification of change of bank as yet. However when I look today there is a second due date 31/01/2016, please can you tell me what this means he has not recieved his refund as yet ?