![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSkhh_KM7Lc4oefxCUMu8oLD49ZsG9ijuWqbyVSVseNWq1W_ypI5miOplAEXe1tfAEH7UGfIBprhcYNK8C1Na8c3VNBXyUR1587bPO7m_G4UHYfaTK7wd-MrsOhrMZj0gH6dS_T96wKpY/s320/slot10.jpg)
As it steps up its investigation of the £4.5 billion sector, the Competition and Markets Authority (CMA) is acting because it believes people aren't getting the deal they expect from sign-up promotions, and operators are unfairly holding on to people's money.