A dad was left "disgusted" after receiving a voicemail from an NHS Test and Trace call handler which appeared to contain sounds of two people having sex.
William Ryan, from Basildon, Essex, had missed the early morning call while isolating at home following a positive PCR test result.
But on listening to the voice message when he woke up, he could hear disturbing noises, reports the BBC.
Mr Ryan looked up the number online and found it was a legitimate Test and Trace contact before making a formal complaint.
The UK Health Security Agency (UKHSA) has confirmed it is liaising with the employment agency which hires call handlers as part of an investigation.
Have you experienced something similar to William? Let us know at webnews@mirror.co.uk
Describing the voice message, Mr Ryan said: "Two people were talking and then the two people were having sex, really.
"It was like someone is basically having a good time on a professional call."
He added: "I was quite shocked I had to listen to it around three or four times and I sent it to a few people and was like ''am I hearing right?''
"Everyone I sent it to said 'yes definitely it is what you're saying it is.'"
A week later, Mr Ryan had another call from the same number and then opted to lodge a complaint.
He was asked to send over the voicemail and a screengrab of the number.
He said he just wants an apology, describing the incident as "unprofessional", particularly as he works from home and his kids could have heard it.
The investigation is expected to take 25 days.
The UK Health Security Agency said: "We have received a complaint from a member of public relating to a voicemail message
received from an NHS Test and Trace call handler.
"UKHSA contracts external service providers to deliver this service and expects high standards from all contracted staff.
"We are investigating this matter jointly with the employing agency. We will ensure the provider takes any action necessary
following the investigation."
The UKHSA has contacted 27million people during the pandemic and says it has helped detect 9 million Covid cases.
In October, however, a report by MPs claimed £37billion had been spent on the "eye-wateringly expensive" scheme and had failed to break the chains of transmission, prevent lockdowns or allow people to return to normal life.
