Hi,
I had 25 Euros due with o2. While paying 25 Euros yesterday, I used the Customer Number that was in my Contract paper which o2 sent me by Post. But now as I look at myo2 account, the customer number under “Invoice” is completely different. So I paid again right now using this customer number.
Which one was the incorrect customer number? The one that is currently being shown in myO2 or the one that is in my contract?
One of them must be correct right? Therefore, how can I get refund for the one that was incorrect?
Best regards,
Rubayet Kamal
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Do you still have a my Handy contract? The customer number that appears on the invoice is the correct one.
Yes, I still have the contract. How can I get refund on the amount that I sent with the incorrect customer number?
I'll call the English-speaking hotline tomorrow.
Hello
Welcome to our community 
So you are talking about an o2 my Handy contract where you have now transferred twice?
Yes, you have a contract number and a customer number.
We will receive the payment within 1-3 working days. We can then check whether both payments could be assigned to your customer account. Then you can also leave the credit balance so that it can be offset directly against the next installment due because a payout can take longer than offsetting the double payment.
Kind regards, Kathi 
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