I'm assuming you're buying the house for own stay? Now, let's consider the alternative, after getting your house key not even a single agent contact you bc technically there's no way to reach you.....lead time of getting a tenant is prolonged....and in the subsequent years you have to manually search for agents...now u decide! Cheers. :thumbsup: 

P/s: Tarnishing someone's reputation might not be a good solution...i thought