As noted, to cancel or otherwise amend a listing or buyer agency contract the seller/buyer and brokerage must both agree. Be sure to: Discuss your concerns directly with your Realtor and ask for a resolution of the issues that are bothering you. Keep written notes and make your instructions in writing.
Most estate agents impose a minimum contract period — usually lasting between 8 to 16 weeks, during which you may not be able to switch estate agents without incurring penalties. Be sure to check for specific terms related to termination and the required notice period, which is commonly 14 to 28 days.
If you are a buyer and have signed a Buyer Broker Agreement with a Real Estate Agent, then the only real way to get out of the contract assuming the Buyer's Agent hasn't done anything to violate the terms laid out in the contract is for the Realtor to let you out of the contract.
Only the parties to a contract can amend it and then, only if they both agree to do so. Standard form listing and buyer agency contracts doesn't contain any provision for an early cancellation. As noted, to cancel or otherwise amend a listing or buyer agency contract the seller/buyer and brokerage must both agree.
For these reasons, the best way to go about canceling a contract with a Realtor is to simply call the broker and explain your desire to end the contract with their agent. Many reputable brokers who wish to stay in your good graces (and with the community's) will let you out of the contract.
Writing a resignation letter, email, or message to tell your real estate broker you are leaving is a standard practice. The goal of such a letter isn't just to convey the decision but to do so in a manner that maintains a good relationship and respects the professional bond shared.
Simply send them a letter or email stating that you are no longer working with them effective immediately. You are not obligated to work with any realtor you don't like. Cut contact after sending the message and contact the new realtor.
Contact the agent and say that you wish to end your agreement. Optionally, you can explain the source of your displeasure. But the best way is to announce to the agent that you wish to end your agreement.
The 14 day cooling off period During the first 14 days after you have entered the contract you have the right to leave the contract without incurring a penalty.