Cancel your Sosh subscription by mail
Cancelling Sosh means putting it in writing; the company takes requests by mailed letter, and a tracked one leaves a clear record. Sosh receives written requests in Lille, France.
Let Postbye cancel Sosh for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
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Postbye is not affiliated with Sosh.
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- 2 Sosh cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Sosh by mail
Find your account details
Start with the account number, the phone number or service address being cancelled and the name on the account, so the request to Sosh names the right account the first time.
Write your request
The request is prepared in French (template fr), under the subject line “Objet : Demande d'annulation – [your name]”: end the subscription, stop all further charges and confirm in writing to you.
Send it by certified mail
Post it by certified mail to Sosh in Lille, France, using the exact address below, and note the tracking number.
Save the tracking record
It shows the date Sosh received your letter. Check your next statement: no Sosh charge should post after the cancellation date.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Sosh cancellation letter goes
For a letter to Sosh, use TSA 10018, TSA 10018, 59878 Lille, France.
“TSA 10018” is a post-office box or mail-sorting line, so it takes post and not couriers: certified mail is the right way to reach it.
The letter is addressed “À qui de droit,” and its details block uses the labels Titulaire du compte, Adresse de facturation enregistrée and E-mail enregistré.
Prefer to write it yourself? Use our letter template
Before you cancel Sosh, check these
- Check for an early-termination fee or a remaining equipment balance before the cancellation date.
- If you are moving to another provider, keep the line active until the new service works, then cancel.
- Name the exact line or service address. Accounts with several lines can leave one of them running.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Sosh for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Cancelling a phone or internet plan
Phone and internet providers tie cancellation to contracts, equipment balances and notice periods, so the request should name the exact line or service and ask for a final bill in writing.
If a charge shows up after you cancelled, the letter and its receipt are what you put in front of the company or your bank.
Sosh cancellation at a glance
- How Sosh accepts cancellations
- By mailed letter
- Mailing address on file
- Sosh TSA 10018 TSA 10018 59878 Lille France
- Country
- France
- Letter language
- French (template fr)
- Category (from the company name)
- Phone & internet
- Added to the database
- June 4, 2026
- Data last checked
