Do you think it's wise to threat the seller to cancel the transaction and ask for my earnest money if I don't get some type of credit?

As landlords, we need to be hyper-sensitive to any threat to the integrity of the structure.However, I'd recommend you get your own pest control folks to do an assessment and give you a quote.

This threat shows why tax lien investing is so specific as to state, and sometimes county.  

They would just leave if the threat and harassment continue escalating.

And now veiled threats that they will notify other tenants in the building that there is a mold issue.  

Hi David, I know this is an old threat but wanted to rehab a multifamily unit we just purchased and wondering if you could send over the contact info for all american?

hello Diegowelcome to BPhere is a threat with great suggestions https://www.biggerpockets.com/forums/12/topics/652...

Especially when a letter does not contain an immediate threat of litigation, I see not pressing reason to be reactive about it.

Lots of great information in this threat.

Attorneys who engage in asset protection planning help their clients preserve and protect their property in advance of a claim or the threat of a claim.