Margaret Owen's son, Graham Anthony, said he went to her home after receiving the alarm call and called an ambulance at 07:35. He described his mother's distress, saying: "Listening to her repeatedly asking for help and sometimes screaming in pain has left me with a feeling of hopelessness."
Mrs Owen, who has dementia, suffered fractures to her femur and shoulder and needed surgery. She remains in Royal Glamorgan Hospital almost three weeks after the fall.
Mr Anthony said the experience had "knocked my confidence in our health service's ability to respond" and described the delay as "not good enough" and a "huge systemic problem". He has submitted a formal complaint to the Welsh Ambulance Service and the Welsh government.
Lee Brooks, chief operating officer of the Welsh Ambulance Service, said he was "grateful" the incident had been brought to his attention and that "waiting almost eight hours for help is not the standard of service we want to provide". A preliminary review had identified "aspects" of how the call was managed that required further investigation.
The Welsh government said it recognised how distressing it could be to wait for care and that improving access to care was a "key priority". It said a new emergency and acute care policy framework would be published this autumn.
According to published figures for August, 10,977 patients waited 12 hours or more for an ambulance in Wales, 6.3% fewer than the previous month. The median response time for purple calls was within target, while the median for red calls missed target. The median for orange-category calls, introduced in December, was nearly one hour 30 minutes, up from about one hour.
