Indigo Airlines — Full refund

My son K Shreyas Kumar was traveling from Hyd to Phuket on 09 Jan 25 (PNR no T4PR9D)
The indigo staff at the Hyd counter didn't issue boarding pass stating that Retun ticket is compulsory for issue of Boarding Pass.
Further they said that he can book return ticket and then boarding pass will be issued, later within 48 hrs he can cancel the return ticket and he will get full refund on cancellation ticket.
Therefore return ticket from Phuket to Hyd was booked for 13 Jan 25( PNR KVE6YF).
However I am not able get full refund for cancellation ticket.

You can verify the booking time of return ticket and issue of boarding pass which was issued after the indigo
staff had seen the return ticket.

Kindly resolve the matter since the return ticket was booked on the advise of indigo staff and I shall not be penalized.