Without a periodic monthly process, billing errors accumulate (always in the telco's favour) to become 10% of total billed costs. Depending on the level of MAC activity this accumulation can happen in only three years!
This kind of constantly accumulating error has to be dealt with.
The resources required to sift through those billing errors can be prohibitive. The cost to do the bill reconciliation can sometimes be greater than the charges recovered, and compromises have to be made. This leaves many recovery opportinities untouched.
The people at Arcavia have been doing automated bill reconcilation and consistency checking for over 8 years. Automated checking can effectivly eliminate the costs of searching records manually and recording the discrepancies.
With automated bill reconcilation, it can be cost effective to go after items with savings under a dollar.