Ofcom have received more orange related calls recently because of oranges decision to withdraw free broadband for mobile customers.
I you are (were) on orange, and paying more than £30pcm they would gave you a basic broadband package for free. They decided to withdraw it mid-contract, and many people were quite rightly unhappy.
Orange set up a special department to deal with the complaints, but would flat out refuse to budge on anything.
However, if you rang them up and quoted an ofcom complaint reference number, they would instantly do a u-turn and re-instate your 'free' broadband, that you are paying for as part of your mobile contract.
There is a huge thread about it on moneysavingexpert.com and this is what has swayed the ofcom complaints figures recently.