Ofcom does not have enough power to cope with the growing demands of superfast broadband, despite doing well to deliver competition on the country's older traditional copper network.
That is the verdict of a letter sent to the Financial Times by representatives from Sky and TalkTalk, which claim the industry regulator's current powers are "insufficient for the new superfast world".
The letter also stated that Ofcom needed to move quickly in order to ask the Competition and Markets Authority (CMA) to use its far-reaching powers to conduct a full and thorough investigation of the market.
It said: "Only the CMA, with the support of Ofcom, can address the structural barriers to competition that will unlock the next wave of investment in communications infrastructure that the country urgently needs. We cannot afford to wait."
The letter did acknowledge Ofcom's efforts in conducting the most "fundamental review of the communications market in a decade", which has helped identify the problems arising from BT Openreach's ownership of the national telecoms network.
Issues include a conflict of interest in the role of BT, poor-quality customer service, as well as difficulties in enforcing existing regulations.
"The result is a sub-standard experience for millions of customers and diminished opportunity for alternative providers to compete effectively," the letter claims.
It continued by adding that problems could not simply be solved by making slight adjustments to the current regulatory framework.
The letter then outlines the case for increased competition to encourage innovations that would improve service quality, reliability and coverage in hard-to-reach areas.