How to terminate property manager contract in Germany ?

HI Everyone
I need to change my property manager
Contract says “can be terminated in writing with a period of notice of 3 months to the end of the respective year.”
But I need to terminate the contract now due to serious lackness of professionalism that may cost loss of money.

The manager deducted money from rent with no permission from landlord.

•    Should landlord ask tenant to pay rent directly to him now to avoid any more unexplained deductions from manager?
•    How can landlord terminate the Power of Attorney given to his manager?
•    What is the format of Notice of Termination that should be send to manager. Should the above issues be written in the Notice?
•    Will the manager still be responsible to refund to the landlord any invalidated deduction he made?

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