TalkTalk customers have been urged not to click on emails purporting to be from the firm if they aren't sure they are genuine.
A customer known as SM got in touch with the Guardian to state that after contacting the provider in recent months, they would receive a "crudely rendered fake email" shortly afterwards.
The correspondent said the emails would usually start with "Dear client" - a term that TalkTalk does not use - while one email urged them to reset their customer account details.
SM has therefore expressed concern that they are either "very unlucky" or that TalkTalk staff are passing details straight to the scammers.
TalkTalk has responded by insisting it has not had any other reports of customers receiving scam emails directly after speaking to its call agents.
However, the firm said its fraud team has got in touch with SM to carry out an investigation.
Furthermore, it has advised anyone doubting the veracity of an email claiming to be from TalkTalk to get in touch.
"If customers are ever unsure if an email is genuine, we urge them not to click on it but report it to us," TalkTalk said.
The broadband provider added that email scams are a "serious and growing problem" across the UK.
"We’re determined to play our part in combating them via our dedicated scam prevention team," it said.
This comes as TalkTalk is working to rebuild confidence in its handling of sensitive information following a cyber attack nearly two years ago.
In October 2015, a hacker managed to obtain the personal details of nearly 157,000 customers, including their names, addresses and dates of birth.
This led to the company being handed a record £400,000 fine by the Information Commissioner's Office.