You cannot validate a charge you cannot describe. Vendor accountability begins with the ability to say, with precision: this is the service, this is the location, this is the contracted rate, and this is the term that governs it. The moment your inventory drifts from reality, you lose the reference point that makes validation possible. The variance between what you’re billed and what you agreed to becomes invisible, because you no longer have a clean version of what you agreed to.

Carriers operate from a complete inventory. Theirs is current, because their billing depends on it. Every service you’ve ever ordered, every move-add-change, every auto-renewing term sits in their system, accurately maintained, working in their favor. The asymmetry is the whole problem. They know exactly what you’re paying for. You’re working from a document that stopped being true three years ago.

This is the gap where unauthorized charges live. Not in dramatic fraud — in drift. A promotional rate that reverted at a renewal date nobody was tracking. A service provisioned for a project that ended, never used and never removed. A move-add-change that updated the carrier’s records and never updated yours, so every invoice since has been measured against the wrong baseline. Each one is small. None of them shows up unless you have an inventory accurate enough to compare against the bill, line by item.

Our reference engagement makes the point. A multi-brand retail portfolio across two carriers — and the first work there wasn’t disputing anything. It was rebuilding the inventory: establishing, for every service and every location, what was contracted, what was billed, and where the two diverged. Only then could validation begin.

The numbers came out of that reconciliation, not out of a negotiation. Once the system of record was rebuilt, the variances finally had something to be measured against — and over thirty-one months that surfaced $2,122,436 in unauthorized charges, $1,852,314 of it credited back at an 87% collection rate. What the CFO actually saw was the approved telecom budget falling 16.9% from one fiscal year to the next, with no service cut to get there. None of it was reachable until the inventory was accurate enough to dispute against. You can’t challenge a charge against a contracted term you can’t locate.

I want to be precise, because the market already has a category for inventory and it isn’t this one. Telecom expense management treats inventory as data hygiene — keep the records clean, feed the reporting. That’s necessary infrastructure. But an inventory maintained to feed a dashboard is built to a different standard than one maintained to hold a carrier to its contract. The reporting version tolerates a record that’s roughly right. Validation won’t: a charge you can’t trace precisely to a term, a location, and an owner is a charge you can’t dispute. Same word, different instrument, different standard of accuracy.

That standard is unforgiving. The inventory has to be accurate enough that any line on any invoice traces to a contracted term, a location, and an owner — and any variance gets flagged inside the dispute window, before the right to challenge it expires. That’s not a tidiness exercise. It’s the control surface for the entire telecom estate.

If you’re a CIO and you can’t answer “what exactly are we paying for, and against what term” without calling your carrier, your carrier is governing your spend. Not you. The inventory is where you take that control back — or where you quietly cede it, one un-reconciled bill at a time.

Rebuilding it is unglamorous work, and most internal teams don’t have the room to do it while running everything else. That reconstruction — establishing the validation-grade system of record, then holding every invoice against it, line by item — is the work Bearstone does. It’s where every engagement starts, because nothing downstream is defensible without it: every dispute, every credit, every contracted term you mean to enforce comes back to one question — accurate against what?

If you can’t answer that today, you don’t have a governance problem yet. You have an inventory problem. That’s the one we start with.