There is no possibility to cancel the payment.

If you believe that the payment from your Mistertango account was made by another person who does not have this right or your account has been illegally used in another way, you must submit a written claim and send it to
Please be advised that the submission of a claim is taken deposit of EUR 50. If the information that you have provided is correct and your account has actually been misused deposit will be returned to you. If the information is incorrect, the deposit is not refundable, 50 EUR is charged as administration fee.