Santander Bank US Bank Account Or Service Complaint

Santander Bank US Bank account or service department,

Checking account Problems caused by my funds being low New Jersey

I have - separate accounts with the Santander bank so as not to co-mingle funds for a - property that I own. I recently deposited a check into my personal account. That check was returned for insufficient funds however it was charged to an unrelated account. I 've contacted the bank and explained that I did not want funds comingled however, the bank representative stated that this was " not best practice '' but legally acceptable. By doing this this bank has reduced the balance in this account to a very low level and has put me at risk for insufficient funds in this account only. If they would only correct their mistake and use the proper account there would be no issue.