The exact process we use to audit client bills. Work through it with your last three invoices and you will find what is genuinely recoverable and what is not, before anyone quotes you a potential monthly savings before any negotiation starts.
Collect the last three months of invoices from every telecom vendor - internet, phone, mobile, data circuits, cloud, and any managed services. List every vendor name, account number, and monthly cost in one spreadsheet, and note who internally manages each relationship.
Then note each contract's expiration date and auto-renewal terms. Auto-renewals often lock you in for one to three years at above-market rates, and they are the single most expensive thing on most bills.
Five sections, worked in order.
Anything you could not identify or confirm in use comes off the bill first. That work needs no negotiation.
Carriers must refund legitimate billing errors. Put the request in writing with the invoice lines cited.
That is your negotiation window. Bring a carrier-neutral advisor into it so the carriers are bidding against each other rather than against your patience.
Send your recent invoices and we handle the whole audit, with findings in writing and no obligation.