(a) Unless expressly stated otherwise in the Contract or in these GBTC, neither party to the Contract is entitled to terminate the Contract unilaterally (for example by resignation or termination, etc.), unless such prohibition would be in conflict with mandatory legal provisions.<br> (b) The User is entitled to terminate the Agreement in the event that the Operator changes, supplements or otherwise modifies these GBTC. In such a case, the termination of the Agreement is effective on the effective date of the amendment or supplement to the GBTC.<br> (c) The Operator is entitled to suspend the provision of Services and at the same time has the right to terminate the contractual relationship between the Operator and the User established on the basis of the Agreement, if the User seriously violates these GTC.