If you are a consumer, you are entitled to a statutory right of withdrawal, so that you can revoke your contract in accordance with the following instructions:
Revocation, for a service contract:
2. Model withdrawal form
The model withdrawal form you can print [HERE].
3. Information on and Termination
In the following cases, the possibility of extinction of the legal right of withdrawal is:
1) In accordance with § 356 para. 4 BGB with contracts for the provision of services, where the principal has the service is completed and has started the execution of the contract only after the consumer has given to his explicit consent and simultaneously confirmed his knowledge of that he loses his right of withdrawal for complete fulfillment of the contract by the contractor.
In this case goes to the consumer (as defined in § 13 BGB) initially entitled statutory right of withdrawal.