3 Hellopeter complaints and claim still not paid

This is my 3rd Hellopeter complaint and still my dad's claim has not been honoured. My dad was a stage 4 cancer patient, feeding through a peg on his tummy. The Out of Hospital Specialised Feeds authorised 24 units of Ensure to be reimbursed per month. My dad bought 12 units and processed the claim on the 11th of May 2021. There has been an exhaustive amount of emails going back and forth, and to date, the claim has still not been paid. My dad passed away on the 11th of June 2021. It's very disheartening to see the manner in which our claim is being handled. Please advise as to when this claim will be paid