Telecom billing is a process operated over a very huge platform. Today, the subscriber base has increases so heavily and telephones have touched virtually each point in the globe. Mobile networks and carriers have million plus subscriber bases each as a general rule. Landline telephony also deals in very large volumes. All this makes the chances of misappropriated billing a little higher.
After all even 6 sigma methods imply an error every three million invoices. And let us suggest without inhibition that the telecom manual operations are not a sigma process. There are great many errors and some of the bills are 5 times or more exaggerated. Very few are lucky to have an undervalued telecom bill.
Today, much of the invoicing is done through telecom audit software. This helps in analyzing the bills far more meticulously with just a few errors. Even such errors are marginal and can be offset with the next bills. Technical glitches are unheard of and at such rare times, the process can be stopped till the glitch is being recovered.