If he/she is your listing agent you need to ask them to withdraw your listing and release you from the contract.
Most reputable reltors will do this
Our position is that it's always best to try to resolve your issues.....many times the service and committment will increase beyond your expectations. It's sometimes difficult to be direct and express your concerns but doing so can make the difference.
Please review your listing agreement. The standard listing agreement for the Great Tampa Area Realtors has an area for penalty if any for withdrawal from listing agreement. Contact your agent and be up front with your displeasure. Perhaps you can work it out. You may have the right to withdraw without penalty if there is gross negligence with some intervention from the Realtor Association.