TALKTALK has gone down leaving hundreds of customers unable to access their email.
The mobile phone and broadband provider is suffering technical problems as the rest of the UK struggles in a heatwave.
Furious TalkTalk customers took to social media to complain about the issues.
TalkTalk told The Sun there was no internet outage but there were some issues with email and its customer services systems which it was working to resolve.
One said on Twitter: “No email coming through, is the site down again?”
Another said: “If the TalkTalk network is down, how do we contact TalkTalk. Is there a phone number?”
A third person added: “Internet been out for the past two hours. Can’t even log into my TalkTalk account to report a fault.”
TalkTalk responded to comment on Twitter addressing the problems.
It said: “Some of our systems are down, meaning our customer service teams are unable to support with queries at this time.”
It told people to head to its community forum if they needed supported.
This web page gives a service status report depending on your area – if it’s green, it should mean there are no issues.
When we checked, the only issue flagged was a yellow warning on “websites and support”, which said there were delays in the Customer Service team answering calls currently.
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The firm added: “Your patience is greatly appreciated while we resolve this issue.”
The issues appear to have started around 2pm on Tuesday July 19, according to website Downdetector.
By 4.30pm there were more than 650 reports logged.
Some 55% of the issues reported related to internet, 38% to email, and 8% to phone signal.
This isn’t the first time the network has suffered technical issues.
Earlier this year, the mobile phone provider had an outage, with hundreds of customers complaining they had no internet or email.
And on a separate occasion, a “mystery outage” left customers unable to check their messages.
Can I get compensation for an outage?
You might be entitled to compensation if you have issues with your internet or mobile phone services.
Your first step should be to report the outage to your provider.
Compensation should be allocated without you having to apply under the Automatic Compensation Scheme.
Broadband and phone providers are signed up to this, and under it their customers can get money back when things goes wrong.
How much you get will vary depending on the situation, but internet firms usually pay out £8 for each full day that broadband or phone services are not repaired after two full days of no service.
Elsewhere, a number of mobile phone firms have reintroduced EU roaming charges this year.
And one expert reveals the simple tips to help you cut your mobile phone bill by £300 a year.