If someone have your wallet address, tje first thing is to stop using that wallet and probably try to withdraw all the funds you have their before the person outsmart you. You must first investigate how got leaked to be able to prevent future occurrence.  Did you save the wallet in your phone where people have access to? Did you save the keys in your email or social media ? You just have to investigate how it happened so you can protect yourself because if you do not do this, even if you make a new wallet, the phrase can still be leaked