People queueing at a vaccine centre in Oxfordshire have been turned away after demand meant no more walk-ins were available.
Simon Cole has a spinal cord stimulator which helps stimulate the muscles in his body following a road accident in 2003.
He was told he had to get his booster jab as he was classed as vulnerable and called 119 to book an appointment.
He says he was told to 'go down because they've got plenty of room', but when he arrived at Exeter Hall in Kidlington, he was informed there were no more walk-ins available.
Mr Cole said: "I just don't know what the system is with vulnerable people that have conditions, and there are people that are just turning up willy-nilly."
"I'm just frustrated right now."
Maggie, 71, also queued for a walk-in appointment but was turned away due to demand.
She said: "I just feel very annoyed. My husband is nearly 20 years older than me, so every care was taken."
"Both of us have had lots of sickness problems. I just feel let down. I was prepared to stand and wait as long as it took."
The centre is still continuing to administer the booster vaccines for those who have booked an appointment.