Sylvia said: "It was a shambles. I spoke to staff several times but was dismissed. For 34 hours his care was non-existent.
"I was given the impression he had at least been given some antibiotics, even if they weren't the right ones.
"But to find out he was in hospital for all that time with no treatment was very hard.
"They had a duty of care to look after him, they were the professionals but in the end he didn't stand a chance."
The PHSO can be contacted by anyone unhappy with the way organisations such as the NHS have responded to their initial complaint.
Chief executive Rebecca Hilsenrath KC, said: "Losing a life through sepsis should not be an inevitability.
"But we are seeing the same failings repeated time and time again, and complaints about sepsis have more than doubled over the past five years.
"We also see poor communication between patients and clinicians and we are focusing our efforts to help improve this throughout the NHS."
Sylvia confirmed she had received a written apology, which she she described as "like a form letter" but had not seen an action plan the trust had been told to provide.
Karen Jessop, chief nurse at the trust, said: "We are truly sorry for what happened in this case and for the loss experienced by the patient's family.
"We reviewed the information and care provided at the time through our Patient Safety Panel.
"Immediate actions were implemented to strengthen how antibiotics were prescribed, escalated and given."