Incorrect charge for an unused tariff

Hello,

I can not speak German well and it’s not easy for me to fully understand your website. That’s why I’m trying to contact you via email, but I couldn’t find a direct email address for customer service on your website.

I recently noticed that money has been withdrawn from my account for a tariff that I haven’t used since 31.07.2024.
Customer number: XXXXXX

Last year, I went to one of your branches in Stuttgart after realizing that I had made a mistake activating an eSIM and asked for it to be cancelled. I was told that the cancellation was completed, but it seems it wasn’t actually processed.

Since the amount was not very large, I only noticed this issue recently. Under my riff I can only see the invoices linked to Customer number XXXXXX (for my home internet and mobile line), but not the one related to Customer number XXXXXX

Could you please explain what this charge is for? You can verify in your system that I haven’t used the internet service associated with this tariff.
I kindly ask you to cancel this tariff immediately and refund the amounts that were charged in error.

Thank you in advance for your help. Please contact me if you need further details.

Best regards

Edit: removed customer numbers for privacy reasons // 03.11.2025, 10:54 Uhr, o2_Rebecca