For the situation you described, if your performance sales are very good, but your monthly performance appraisal is unqualified, and the company requires you to transfer, then you need to analyze your work performance and the performance appraisal standards stipulated by the company. If you really can't meet the standards and requirements stipulated by the company in the monthly performance appraisal, the company may have the right to ask you to change your post, but you must abide by the contract and labor laws and regulations, and provide reasonable solutions and compensation measures.
If you think that the company's handling of you is unreasonable or illegal, you can communicate and negotiate with the company, put forward your own opinions and suggestions, and seek the support and help of relevant departments or institutions. If you think that the company's handling involves legal issues, you can consult relevant labor law experts or lawyers for more specific and professional advice and guidance.