A Sky spokesperson said: "For years, BT has been under-investing and delivering poor quality service for customers.
The OFT said pension schemes containing £40bn worth of savings are, or may be, delivering "poor value for money".
In September, the OFT published a report criticising pension schemes containing £40bn worth of savings that were delivering "poor value for money".
Additional lawsuits alleged HealthSouth had committed widespread abuse of Medicare by "billing for services it never provided, delivering poor care, treating patients without a formal plan of care, and using unlicensed therapists".
The company was accused of billing for services it never provided and delivering poor care, treating patients without a formal plan of care or using unlicensed therapists.
Southern Water had been delivering poor service and misleading Ofwat about its data for five years, until 2005.
Of the £40bn the OFT says may be delivering poor value, £30bn is in old and high-charging schemes, while £10bn is in small schemes which are "at risk of delivering poor value for money due to low levels of trustee engagement and capability".
He said: "For years, BT has been under-investing and delivering poor-quality service for customers.
It is also gaining a reputation for its disastrously expensive contracts that deliver poor value for taxpayers and often poor performance for the military.
