Good morning, as far as I know, you can cancel the music flat rate. But first, you should remove your cell phone number from the post. You are in a public forum here and everyone can see your phone number. It's best to call customer service, they'll be able to help you quickly.

Here is the contact information

O2 Service in English

Our English language postpaid and landline support for you. We're here to help.

089 66 66 30 08 1

Mon - Fri 8 a.m. - 8 p.m., Sat. 10 a.m. - 6 p.m

Regards

Hello @Karen1768, welcome at our community.

I am very sorry if there maybe was a misunderstanding at the store.

Where you able to reach the Englisch Hotline? We are also happy to help you here, but it might take a while.

Kind regards, Ines.

Hello 

Sorrily the guy that we bought simkard and made contract with him didn't reply to our several requests.we asked him to edit the contract or cancel the contract.where is English hotline ?

Hi @Karen1768, I am very sorry to hear that.

0179LoopUp posted the number for our English Hotline above. Please have a look at his answer.

Kind regards, Ines.

Ok I will contact you.but how can I delete my post ,because I made a mistake to post my phone number in public post .I don't know how to delete my first post.

Thats okay we edited your phone number.

Schönen Tag noch

@Karen1768 Vielen Dank, wir wünschen dir auch noch einen tollen Tag und einen super Start in die neue Woche morgen . 

(Thank you very much, we also wish you a great day and a great start into the new week tomorrow  )

Kind regards Matze