The ISP has sent an email to 103 users informing them that if they do not moderate their usage they will be cut off from LineOne's SurfTime Package. The £9.99 deal claims to offer fixed-rate unmetered weekend and evening access.
In an email to users, Tiscali advised, "Unless we see a significant reduction in your abnormally high usage level, we may be forced to terminate your LineOne SurfTime account in accordance with Clause 5.4 of the LineOne SurfTime terms and conditions."
Last year, LineOne halted its unmetered internet access service, claiming that its popularity was costing the company too much money. The company sent a similar email to subscribers to its 24/7 Net flat-rate service telling them it would end on September 30, to be replaced by the current SurfTime deal.
The incident followed a number of other similar incidents as companies cancelled their free internet services for cost reasons. These included Breathe, which closed its Breathe Freely service having first withdrawn the flat-rate service from 500 of its heaviest users.
Tiscali bought LineOne, the UK internet venture formerly owned by BT and United Business Media, for ¬100m (£62.4m) in cash and stock in April and is now believed to be the fourth-largest ISP in the UK and the second-largest in Europe behind Deutsche Telekom's T-Online.