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1LINE Complain

Something went wrong. Turn it into a complaint that gets a response.

Run 1LINE Complain →

What it does

From frustration to a complaint that lands.

When a company lets you down, the hardest part is knowing what to write and where to go next. 1LINE Complain takes one paragraph about what happened, rates how strong your complaint is and shows what’s missing — then builds the complete strategy: the letter, the timeline, the deadline and the escalation route.

Flights, faulty goods, energy bills, landlords, banks, broadband. Every letter is built from your own account of what happened — factual, firm and ready to send.

Example input

“My airline cancelled my flight 3 hours before departure and refused to rebook me or offer a refund.”

Example process

1LINE Complain input — describe what happened

Step 1 — Tell us what happenedOne paragraph: who did what, when, what you’ve already done and what you want. Type it or speak it.

1LINE Complain free analysis — complaint strength and what is missing

Step 2 — Free analysisSee your complaint strength — Strong, Moderate or Needs More Evidence — and what’s missing before you send anything.

1LINE Complain full report — letter, timeline and escalation route

Step 3 — Unlock the full reportReceive the letter, timeline, evidence checklist, escalation route and follow-up pack.

An example of the 1LINE Complain journey — what happened, how strong it is, what to send.

What you receive

Try it first

You don’t have to commit blind. Tell us what happened and 1LINE Complain returns a free analysis — what we heard, how strong your complaint is, and what’s missing.

If you want everything ready to send, unlock the full report. The free analysis shows you where you stand; the decision stays yours.

Tell us what happened → See your complaint strength → Unlock the full report

How it works

One paragraph. Everything ready to send.

1

Describe

What went wrong, when, and what you want from them. Type or speak it.

→
2

Complaint Strength

Rated Strong, Moderate or Needs More Evidence — free.

→
3

What’s Missing

The details that would make it harder to dismiss — free.

→
4

Full Report

Letter, timeline, evidence checklist, deadline and escalation route.

→
5

Send & Follow Up

Reminder, escalation and final letters ready if they go quiet.

What makes this different

Firm, factual and hard to ignore.

Complaining without a plan
An angry email that’s easy to ignore
No deadline, no follow-up
Not knowing where to go next
Missing evidence noticed too late
Starting from a blank page
1LINE Complain
A factual letter that’s hard to dismiss
A clear deadline — and follow-up letters ready
An escalation route to the right ombudsman or regulator
An evidence checklist before you send
Built from your own account of what happened

Built for clarity. Not legal advice.

It helps you complain well.
It isn’t a solicitor.

1LINE Complain gives you structure and wording. It doesn’t give legal advice or guarantee an outcome. For complex or high-value disputes, Citizens Advice or a qualified adviser can help.

If the problem is with a person rather than an organisation, 1LINE Resolver is built for that.

Free first. Unlock when you need it.

Free analysis

£0 instant

  • ✓ What we heard
  • ✓ Complaint strength rating
  • ✓ What’s missing

Full Complaint Report

£9 one-time

  • ✓ What happened & your timeline
  • ✓ What went wrong
  • ✓ Evidence checklist
  • ✓ Complaint letter — ready to send
  • ✓ Response deadline
  • ✓ Escalation route
  • ✓ Follow-up pack & final letter

One-off payment. No subscription. No account needed.

Something went wrong.
Make it count.

One paragraph in. The letter, the timeline and the route forward.

Run 1LINE Complain →