CenturyLink

Get help with (4)

• Billing errorCall or chat before the due date; if not fixed, send a written Notice of Claim.
• Bill went upCenturyLink must give 30 days written notice of a monthly charge increase.
• Cancellation problemCancel by phone or chat (not email), then return leased equipment within 30 days.
• Equipment returnReturn leased equipment by UPS within 30 days; CenturyLink stores do not accept returns.

Contacts (12)

Escalation path

Go up one step at a time. Keep the reference numbers and dates from each contact.

1. Customer service

   PhoneCenturyLink account and tech support ("CTL Only" region on the contact page) +1-800-201-4099

2. Retention team

   OnlineHow to cancel your CenturyLink service (call or chat)
   EmailQuantum Fiber customer service email (billing disputes, cancellation, equipment) fibersuccess@quantumfiber.com

   CenturyLink publishes no retention number.

3. Written complaint

   EmailCenturyLink written Notice of Claim (required before a lawsuit) legalaffairs@lumen.com

   CenturyLink requires a written Notice of Claim before any lawsuit.

4. Federal regulator

   RegulatorFederal Communications Commission, Consumer Complaint Center +1-888-225-5322

5. State agency

   Your state’s utility commission. Find it in the list of state agencies (also as JSON: states/<code>.json, for example states/ny.json).

6. State agency

   Your state’s attorney general. Find it in the list of state agencies (also as JSON: states/<code>.json, for example states/ny.json).

7. Small claims court

   The CenturyLink agreement sends disputes to court (bench trial, jury waived), not arbitration, after a 60-day resolution window. CenturyLink reimburses small claims filing fees when the terms are followed.

8. Arbitration

   MailQuantum Fiber Notice of Dispute (AT&T legal department) Legal Department - Notice of Dispute, AT&T, 208 S. Akard, Office

   Quantum Fiber (AT&T) customers only. Send the Notice of Dispute first and allow 60 days after a complete notice.

Known blockers

Scam warnings

Verification notes

"CenturyLink" is a trade name of affiliates of Lumen Technologies, Inc. (per the Internet Subscriber Agreement effective November 1, 2025). Quantum Fiber is now "Quantum Fiber from AT&T": its subscriber agreement (V.02.02.2026) is between AT&T and the customer and incorporates the AT&T Consumer Services Agreement, and quantumfiber.com carries AT&T branding. CenturyLink copper/DSL service remains with Lumen; its site does not mention AT&T. Quantum Fiber channels are kept here for lookup; for AT&T Fiber accounts use the AT&T file.