"Lack of communication is abysmal"

My dad was seen at the start of January at the Endosponge clinic and was instructed by the nurse that he would receive his results within 6 weeks. We assumed rightly or wrongly that after the 6 weeks no news was good news. Much to his surprise he received a letter at the start of June stating he may have Barrett’s Oesophagus and requires further scopes and biopsies. I think that a wait of 6 months to be told you have something potentially wrong and you require further treatment is shocking. No further communication has been sent since the letter was received almost 4 weeks ago to confirm further appointments to confirm his diagnosis. The lack of communication is abysmal and needs urgent attention, I don’t think it’s unreasonable to have expected these results to have been delivered to my dad in a timely manner to provide appropriate diagnosis and treatment options discussed.