A British pensioner in Spain has been left traumatised after discovering an Amazon delivery driver performing a sexual act in her bedroom.

The 72-year-old retired social worker found the man, described as being in his twenties, masturbating after he had entered her Costa Brava home without permission.

The incident has sparked a police investigation, with Spanish authorities collecting DNA evidence from the scene.

The pensioner, who has received honours in New Zealand for her charitable work, said she felt unsafe after the same courier returned to her property just two days after the initial incident.

The woman, identified under a fake name as Jane, had buzzed the courier through her property gate via video intercom after ordering mosquito repellent from Amazon.

She requested he wait while she visited the bathroom.

Upon returning, she discovered the tall delivery man had entered her home uninvited, walked through her kitchen and climbed the stairs to her bedroom.

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"I was stunned," she told The Guardian. "He was masturbating vigorously. He turned his back and it was apparent that he ejaculated. He shook his hand and when he turned to me his shorts were wet."

In shock, Jane ordered him to leave immediately and followed him outside.

The courier's return to Jane's property 48 hours later left her feeling exposed and afraid.

Both the young man and his older colleague arrived to deliver another parcel, despite her formal complaint to Amazon and the police.

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She said: "I felt very vulnerable, especially when he came back another time."

During the second encounter, Jane confronted the senior driver directly, stating: "Your colleague masturbated in my house and I've reported it to the police."

The younger courier denied the allegations, claiming his clothing had become wet from a spilled beverage, before his colleague warned Jane he would report her to authorities for making false accusations before they departed.

Spanish law enforcement has opened a formal inquiry into the unauthorised entry and sexual misconduct, according to official documents.

Officers have secured biological evidence believed to be semen from the scene.

Jane declared: "I will not be using Amazon again. I want people to know that it's unsafe."

She wrote to their customer service: "There doesn't seem to be an adequate complaints system.

"There seems to have been no attempt to address what was a serious home invasion and sexual violence against me."

Amazon Spain acknowledged the matter was "extremely concerning" but said its delivery personnel were third-party contractors, not direct employees.

In a statement, the company said: "At Amazon, we take the security and protection of our customers and the communities we serve very seriously.

"This service was provided by a commercial carrier.

"We will keep investigating and clarifying the facts and we will cooperate with the parties that need our collaboration."